Adults

Inspired by our award-winning professional cycling helmet the Trenta, the MET Vinci MIPS exceeds the standards of comfort and safety, delivering an unmatched price-performance ratio. Featuring the MIPS-C2 brain protection system, the Vinci is able to slide against the head in the case of a crash, redirecting damaging rotational motion. The Vinci is also exceptionally lightweight and extremely comfortable to wear. The internal air-channeling works in synergy with the exhaust ports, maximizing ventilation. - In-mold polycarbonate shell with EPS liner - MIPS C2 rotational management system is engineered to add protection in case of certain impacts - Exceptionally comfortable and secure thanks to the refined internal shape - MET Safe-T DUO Fit System - 360° head belt and vertical adjustments offer a customized fit - Straps with adjustable divider maximize aerodynamics and comfort - Comfort pads are hand-washable - 16 vents are internally engineered for air channeling to improve ventilation and comfort - Reflective rear decals to enhance visibility in low-light conditions - Sunglasses ports to securely dock sunglasses when climbing or resting - Certifications CE; AS/NZS Sizing: - Small = 52 – 56cm - Medium = 56 – 58cm - Large = 58 – 61cm

Weighing in at 235 grams, the G1 MIPS is the lightest helmet we have ever made. It is the climbers’ favorite on the ProTour. Not only is it a featherweight, but it’s extremely well ventilated. Twenty-two vents and internal air channels create 8% more airflow over the head than wearing no helmet at all. It’s also comfortable—vital for long days in the saddle. The Super Lightweight ARS Fit System ensures a snug and comfortable fit with no pressure points. The head basket is adjustable. Two sets of pads are included so you can choose between superlight and comfort pads. Awarded the esteemed Virginia Tech 5-Star “Best Available” protection rating, you can trust that the G1 MIPS is a great choice. The MIPS system helps reduce the risk of rotational injury. When you’re after every bit of speed, the addition of the Aeroshell (sold separately) transforms the G1 MIPS into an aero helmet. - Lightweight - Well ventilated (22 vents) - Advanced Rollsys system - Comes with race and comfort pads - Lazer Aeroshell compatible (sold separately) - UCI World Tour helmet - MIPS layer - Construction: In-Mold, EPS foam, polycarbonate, nylon - Weight: 235g - Certification: CPSC

Tackle technical mountain bike trails and test your riding limits knowing you're fully protected with the feature-loaded Jackal KinetiCore helmet. Supreme ventilation, built-in KinetiCore protection technology, and mountain bike-friendly features such as brow vents and an accessory mount make this a trail rider's dream lightweight lid. Leave the protection up to us, so you can confidently enjoy your ride. KinetiCore by Lazer is the world's first responsibly designed and fully Integrated Rotational Impact Protection technology that's built better by design. Integrated right into the helmet instead of added on after, KinetiCore delivers next-level protection in addition to weight reduction and increased ventilation. This helmet scores an esteemed "Best Available" 5-star protection rating from Virginia Tech. With simple and precise fit adjustability, eyewear recesses to stop your sunglasses from digging into your head, and airflow vents cleverly positioned to avoid fogging up your goggles, the Jackal KinetiCore is designed to enhance your mountain biking experience - streamlined with everything you need and nothing you don't. Specifications: WEIGHT: 340g (size medium) MATERIAL: EPS Foam, Polycarbonate, Nylon FIT SYSTEM: TurnSys VENTILATION: 19 ROTATIONAL PROTECTION: Lazer KinetiCore CERTIFICATION: CPSC ACCESSORIES: Action Camera Mount, Optional Universal LED Features: Magnetic Buckle The magnetic buckle connects quickly and is easy to use with full finger gloves. Action Camera Mount Never miss a moment. Jackal KinetiCore helmet includes a built-in camera mount to capture all your favorite action-packed memories as they unfold. The helmet shell is designed to prevent the mount or accessory from intruding into the helmet in the event of an impact. Eyewear Friendly Recesses in helmet shape removes the pressure on inside of head caused by the arms of sunglasses. Tailored Fit TurnSys technology provides a perfect fit on the fly with a simple turn of the dial. The magnetic buckle is easily managed with one hand and gloves on, ensuring your helmet is ready to roll whenever you are. Goggle Grip The no-slip design on the rear of the helmet prevents the goggle strap from moving out of position. Integrated Rotational Impact Protection KinetiCore Controlled Crumple Zones absorb the force of both direct and rotational impacts in the event of a crash to re-direct energy away from your head, protecting you when you need it most. LED Light Compatible Increase visibility by attaching the Universal Lazer LED at the back of the helmet, so you're seen no matter what the daylight or weather conditions are. Stay Cool and Comfortable Cleverly positioned ventilation channels increase airflow to keep you from overheating. When wearing goggles, air is channeled into the helmet above your eyebrows, lowering the chance of your goggles steaming up. Adjustable Visor (Space for Eyewear) Visor adjusts up and down for improved visibility in technical terrain and to keep your eyewear comfortably on hand, with a secure grip to reduce the risk of a goggle slip getting in your line of vision while riding. 5-star protection rating The Virginia Tech impact testing uses the STAR evaluation system to determine the helmet's ability to reduce linear acceleration and rotational velocity of the head resulting from a range of impacts a cyclist might experience. 5-star indicates the "Best Available" rating possible. Virginia Tech recommends the use of any 4- or 5-star rated helmet. Lightweight Design Built 13% lighter and with significantly less plastic than the previous Jackal MIPS helmet, its stripped-back design hits the sweet spot between protection and performance for a lid that's both more sustainably built and ultra-comfortable even on your longest rides.

The Sphere MIPS delivers a perfect combination of great looks, all day comfort, performance and features to help protect in the event of an impact. You will look forward to every ride in the Lazer Sphere MIPS helmet. The ARS Fit System enables progressive fit adjustment via a thumbwheel. It distributes pressure evenly around the head, eliminating hot spots and pressure points. The adjustable head basket is ponytail friendly. Eighteen vents orientated at a 15-degree angle assures maximum airflow when the helmet is in the riding position. MIPS protection helps reduce the risk of rotational injury. A polycarbonate layer built inside the helmet keeps the foam together in the event of a crash, offering better protection from successive impacts. Sphere MIPS has been awarded the 5-Star "Best Available" protection rating from Virginia Tech. A docking area makes eyewear storage easy and bottom-shell protection helps prevent damage to the helmet foam. The optional Aeroshell accessory protects against the helmets or offers an aerodynamic benefit when desired. The Sphere MIPS weighs just 280 grams. WEIGHT: 280g (size small) MATERIAL: EPS Foam, Polycarbonate, Nylon FIT SYSTEM: Advanced Rollsys System (ARS) VENTILATION: 18 ROTATIONAL PROTECTION: MIPS CERTIFICATION: CPSC ACCESSORIES: Optional Aeroshell Sizing: - Small = 52 – 56cm - Medium = 55 – 59cm - Large = 58 – 61cm Features: Lazer Aeroshell compatible Multi use polycarbonate cover which fits over top of your helmet. It covers the front and side vents to protect your head from rain and cold or to gain an aerodynamic advantage. Adjustable Head Basket Allows the back part of the retention system to be adjusted up and down depending upon your preference and comfort. The nylon ratchet system can be pushed high and out of the way, or low for a feeling of increased security. Advanced Rollsys System (ARS) Easily adjust your helmet's fit by using the thumbwheel on the top of the helmet. Lazer's unique fit system prevents hotspots or pressure points by making the adjustment around the entire circumference of the head. MIPS layer The Multi-Directional Impact Protection System (MIPS) helps reduce the risk of rotational brain injury by isolating your head from the rotation of the helmet shell in the event of an impact. 5-star protection rating The Virginia Tech impact testing uses the STAR evaluation system to determine the helmet's ability to reduce linear acceleration and rotational velocity of the head resulting from a range of impacts a cyclist might experience. 5-star indicates the "Best Available" rating possible. Virginia Tech recommends the use of any 4- or 5-star rated helmet. Well ventilated Carefully designed vents and internal channeling pull air into the helmet and across your head for increased airflow. Essential for performance and comfort during high temperatures and hard efforts.

The Tonic MIPS is a great choice if you're wanting a light, comfortable, and good looking helmet at a low price. It looks and feels like a much more expensive helmet, with excellent ventilation and a comfortable fit. Tonic MIPS has the Virginia Tech 5-Star protection rating. The Tonic MIPS road cycling helmet reaps the benefits of Lazer's long history of building cutting-edge helmets. The TS+ Fit System offers progressive fit adjustment and eliminates pressure points and hot spots on your head- essential for long days on the saddle. Tonic MIPS has been awarded the Virginia Tech 5-star "Best Available" protection rating. MIPS protection helps to reduce the risk of rotational injury in the event of a crash. Twenty-eight vents ensure plenty of airflow through the helmet to help you keep your cool even when the pace is on. A rear LED TS+ light can be added for enhanced visibility in low light. The Tonic MIPS weighs a very competitive 280 grams. - 28 ventilation holes - Turnfit Plus system - Rear LED light compatible - Reflective stickers - MIPS layer - Fit System: TS+ Turnfit System - Construction: In-Mold - Ventilation: 28 Vents - Weight: 280g (S) - Certification: CPSC Features: Adjustable Head Basket Allows the back part of the retention system to be adjusted up and down depending upon your preference and comfort. The nylon ratchet system can be pushed high and out of the way, or low for a feeling of increased security. Rear LED Light compatible This helmet is compatible with the integrated Rear LED Light accessory which improves your visibility from the rear in low light conditions. MIPS layer The Multi-Directional Impact Protection System (MIPS) helps reduce the risk of rotational brain injury by isolating your head from the rotation of the helmet shell in the event of an impact. Reflective stickers Reflective materials on the helmet help improve your visibility in low light conditions. Turnfit Plus system (TS+) A unique fit system which prevents hotspots or pressure points by making the adjustment around the entire circumference of your head. Ventilation Intake and exhaust vents increase airflow to keep your head cool and comfortable. 5-star protection rating The Virginia Tech impact testing uses the STAR evaluation system to determine the helmet's ability to reduce linear acceleration and rotational velocity of the head resulting from a range of impacts a cyclist might experience. 5-star indicates the "Best Available" rating possible. Virginia Tech recommends the use of any 4- or 5-star rated helmet.

This isn't your average bike helmet. The CITY is a purpose-built urban helmet featuring Composite Fusion Plus technology, integrated drop-down eye shield, and removable ear pads. The result is a helmet ready to take on any urban commute. Technology: - Composite Fusion Plus: This technology uses a layer of multi density cone shaped foam that intersect with a layer of softer foam that surrounds the head. In an impact, these cones act as a progressive damper to absorb different levels of impact. As they collapse, these cones also direct energy sideways and away from the brain. Features: - Integrated visor - Anti-microbial pads - Removable ear pads - Integrated rear light mount - Sizing: S/M (54-58cm) L/XL (58-62cm)

The Kali Lunati 2.0 is ready for any off-road adventure. This enduro-focused helmet features a deep-coverage design, and aggressive venting to keep you cool. - Includes a Quadcore Low Density Layer - soft gel padding for rotational and low-g impact protection - Features composite fusion - in-molding technology merging the shell and EPS foam liner - 25 vents to keep you cool - Break-away moto-style visor - Removable/washable/anti-microbial pads and bug liner - Accessory mounting system - Vista fit system - Weight: 286g / 10.1oz

Aggressive venting to keep cool, and packed with features in a deep-coverage design, the Lunati fits likes a dream and is ready for any off-road adventure. - Breakaway flex visor - Accessory mounting system - Anti-microbial pads and bug liner - Polycarbonate shell with EPS foam - Micro-fit closure - 25 vents provide maximum airflow

The Kali Protectives Maya 3.0 is an upgraded version of Kali's best-selling Maya helmet. It includes new features such as a dial retention fit system, added venting, and a newly designed visor. - LDL (Low Density Layer) technology is used throughout the interior of the helmet to reduce rotational impact forces up to 25%, and reduce low-g linear forces up to 30% - Composite Fusion Plus technology incorporates layers of multi-density cone shaped EPS foam to absorb different levels of impact and direct energy sideways and away from the brain - Removable/washable liner - Anti-microbial pads - Flex moto-style visor - Bug liner - Locking buckle and sliders - Dial rention fit system

The Kali Protectives UNO Helmet is the one helmet to rule them all. The UNO looks great, stays cool, and offer exceptional safety wherever the road might take you. - LDL - QuadCore technology is used throughout the interior of the helmet to reduce rotational impact forces up to 25%, and reduce low-g linear forces up to 30% - Anti-microbial pads - Locking buckle and sliders - Micro-fit closure system - 21 vents

- MIPS' added protection system has been proven to reduce the rotational motion when implemented in a helmet by absorbing and redirecting energies and forces otherwise transmitted to the brain. - Dual-density Varizorb EPS provides improved protection by spreading forces of impact across a wider area - 8 Big Bore vents and 7 exhaust vents keep you cool and aid in moisture management - The securely fixed visor is positioned to channel airflow into the Big Bore vents - Fidlock SNAP helmet buckle provides quick and secure entry and exit while wearing gloves - Removable antimicrobial and moisture wicking liner - Includes additional pads for custom dialed fit

Our Full-Coverage Open-Face MTB Helmet Redefining open-face helmets, the Dropframe Pro has earned Virginia Tech's best rating (5 STARS) in their Bicycle Helmet Ratings program with the best rating of any helmet they have ever tested. Super-light and extremely comfortable, it's the choice for trail riders seeking more coverage, more confidence, and more fun. This game-changing open-faced enduro helmet features MIPS, our dual-density Varizorb EPS liner, and increased coverage for the ears, jaw, and back of the head. This MTB helmet provides the most complete coverage we offer in an open-face helmet. Features - Proven MIPS impact protection system reduces rotational forces in a crash - Dual-density Varizorb EPS liner is meant to provide improved impact protection - 8 Big Bore vents and 7 exhaust vents keep you cool and aid in moisture management - Fixed visor is positioned perfectly for maximum air flow - Fidlock SNAP helmet buckle provides quick entry and exit - Removable antimicrobial and moisture-wicking liner - Includes additional pads for a custom fit - Small = 52 – 54cm - Medium = 54 – 56cm - Large = 56 – 58cm - X-Large = 58 – 60cm Certifications - CPSC - EN 1078 - AS/NZS 2063

Flight Helmet from Fox Racing.

MIPS' added protection system has been proven to reduce the rotational motion when implemented in a helmet by absorbing and redirecting energies and forces otherwise transmitted to the brain. - Fox integrated chin bar is secured to the helmet with our patent pending system and meets ASTM downhill standards. - Highly breathable liner system is moisture wicking and has anti-microbial properties - 15 Big Bore vents and 9 exhaust vents keep you cool and aid in moisture management. - The securely fixed visor is positioned to channel airflow into the Big Bore vents. - Fidlock SNAP helmet buckle provides quick and secure entry and exit while wearing gloves. - Dual-density Varizorb EPS liner provides improved protection by spreading forces of impact across a wider area. - PC, EPS, Pu, Polyester, Ss

The Proframe helmet is the lightest and most breathable full face helmet Fox has ever created. Designed to perform at the highest levels for the aggressive all mountain rider and enduro racer, it packs DH certified protection into a superlight shell via Fox's patent-pending, fully-integrated Chinbar. With 24 Big Bore vents, the Proframe offers open face level airflow and breathability to keep you cool on even the longest and most challenging climbs; and once you reach the top, it gives you the confidence to ride to your limits on even the toughest of descents. Features: - Ultra-lightweight enduro and all mountain helmet - Patent pending integrated chinbar - Highly breathable, moisture wicking and anti-microbial liner - 24 Big Bore vents for unrivaled breathability - Fixed visor is positioned perfectly for maximum air flow - Fidlock SNAP helmet buckle provides quick entry and exit - MIPS™ impact protection system reduces rotational forces in a crash - Dual density Varizorb EPS liner provides improved protection - Our lightest DH certified helmet: 750g. (size medium) Certifications: - ASTM F1952 (including chin bar rigidity test) - EN 1078 - AS/NZ 2063 - CPSC

Think you can't get a lightweight, breathable full-face helmet Think again. The Proframe RS Helmet is the new pack leader, lapping the competition in fit, function, and style. It offers class-leading fit and security care of the BOA fit system, while the increased ventilation and decreased surface contact area ratchet up the cooling properties of this savvy lid. In the event of a crash, the Mips Integra Split impact protection system when combined with the EPP liner with the EPS layer is designed to reduce rotational forces, keeping you more protected against injury on the trail. Additional features that elevate this helmet above the competition include a 3-position adjustable visor that works with goggles, an included removable under-visor GoPro mount, Fidlock magnetic closure for easy on-off, plus an ionic+ antimicrobial liner and cheek pads to help optimize fit. Welcome to the next-level protection of Proframe RS.

Proframe RS Mhdrn from Fox Racing.

Pro-inspired full-face mountain bike helmet featuring MIPS. - MIPS' added protection system has been proven to reduce the rotational motion when implemented in a helmet by absorbing and redirecting energies and forces otherwise transmitted to the brain - Lightweight fiberglass shell construction designed for strength and performance - Goggle compatible adjustable visor - Removable, washable moisture wicking liner - Lightweight and reliable Double D-Ring closure - Fiberglass, EPS, EVA, PC, PCV, Polyester

The Rampage Comp Matte Black Helmet offers a class-leading feature set including MIPS, a lightweight fiberglass shell, fully-adjustable visor, and many other options usually reserved for much more expensive mountain bike helmets. The design is inspired by our championship-winning Rampage Pro Carbon and maintains that aggressive design which looks as fast sitting still as it does on the bike. Features - Proven MIPS impact protection system reduces rotational forces in a crash - Lightweight fiberglass shell designed for strength and performance - Goggle compatible adjustable visor - Removable, washable moisture-wicking liner - Lightweight and reliable double d-ring closure

Aggressive Styling In Our Most Affordable DH-Certified Helmet Our Rampage Helmet features a lightweight, injection-molded ABS shell inspired by our iconic Rampage Pro Carbon Helmet. Large vents provide superior airflow for all-day comfort. The fully adjustable visor and quick release buckle add big-mountain function to this full-face MTB helmet. - Proven MIPS impact protection system reduces rotational forces in a crash - Lightweight, injection-molded ABS shell - Inspired by our podium-proven Rampage Pro Carbon - Mesh vent screens provide ventilation while filtering dirt and debris - D Ring closure - Adjustable visor CERTIFICATIONS - CPSC - EN 1078AS/NZS 2063 - ASTM 1952-15 downhill - ASTM 2032-15 BMX

Aggressive styling in our most affordable DH certified helmet. - Lightweight injection molded ABS shell - Inspired by our podium proven Rampage Pro Carbon - Injected Mesh vent screens maintain superior ventilation and airflow while providing protection from dirt and debris - Double D-Ring closure - Adjustable Visor - PC, ABS, PA, EPS, Polyester

Proven MIPS coverage for superior open-face performance - MIPS' added protection system has been proven to reduce the rotational motion when implemented in a helmet by absorbing and redirecting energies and forces otherwise transmitted to the brain - Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle compatible, 3 position adjustable visor - Removable, washable moisture wicking liner - 360°Fit System allows you to dial in your perfect fit every ride - EPS, PC, PA, Polyester

The Speedframe MIPS Helmet has premium features usually meant for much more expensive helmets. A MIPS liner, goggle compatible 3-position visor, and our 360-degree fit make the Speedframe one of the best values in an open-face mountain bike helmets. Add in the legendary aggressive Fox design DNA, and you have one of the most shred-ready mtb helmets in the market today. - Proven MIPS impact protection system reduces rotational forces in a crash - Removable, washable moisture-wicking comfort liner - Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle compatible 3-position adjustable visor - 360 fit system allows you to dial in your perfect fit every ride - Note: Avoid exposure to aerosol sprays like bug repellent and sunscreens as they can cause your helmet's finish to peel - Weight: 360 g, medium

The Speedframe Helmet has premium features usually found only on much more expensive helmets. A Mips liner designed to reduce rotational motion and redirect forces away from your brain should you crash, a goggle-compatible 3-position visor, and our 360-degree fit system makes the Speedframe one of the best values in open-face mountain bike helmets. Add in the legendary aggressive Fox design DNA, and you have one of the most shred-ready mountain bike helmets on the market today.

Proven MIPS Coverage for Superior Open-Face Performance The Speedframe MIPS Helmet has premium features usually meant for much more expensive helmets. A MIPS liner, goggle compatible 3-position visor, and our 360-degree fit make the Speedframe one of the best values in an open-face helmet. Add in the legendary aggressive Fox design DNA, and you have one of the most shred-ready trail helmets in the market today. Features - Proven MIPS impact protection system reduces rotational forces in a crash - Removable, washable moisture-wicking comfort liner - Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle compatible, 3-position adjustable visor - 360 Fit System allows you to dial in your perfect fit every ride - Weight: 360g Sizing - Small = 51 – 55cm - Medium = 55 – 59cm - Large = 59 – 63cm Certifications - CPSC - EN 1078 - AS/NZS 2063

Performance-focused open-face trail helmet - MIPS' added protection system has been proven to reduce the rotational motion when implemented in a helmet by absorbing and redirecting energies and forces otherwise transmitted to the brain - Dual-density Varizorb EPS provides improved protection by spreading forces of impact across a wider area - Fidlock SNAP helmet buckle provides quick and secure entry and exit while wearing gloves - Removable, washable XT2 liner is antimicrobial and manages odor while wicking moisture away from the head - Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle compatible, 3 position adjustable visor - 360°Fit System allows you to dial in your perfect fit every ride

Performance-Focused Open-Face Trail Helmet The Speedframe Pro Helmet has earned Virginia Tech's best rating (5 STARS) in its Bicycle Helmet Ratings program. Designed with input from our pro mountain bike athletes, this top-tier open-face trail helmet offers a market-leading feature set including MIPS, an easily adjustable multi-position visor, and a 360-degree fit system. The pro version is equipped with a Varizorb dual-density EPS liner, Fidlock SNAP helmet buckle, and an XT2 antimicrobial comfort liner. Features - Proven MIPS impact protection system reduces rotational forces in a crash - Varizorb Dual-density Varizorb EPS - Fidlock SNAP helmet buckle provides quick and secure entry and exit while wearing gloves - Removable, washable XT2 liner is antimicrobial and manages odor while wicking moisture away from the head - Optimized venting with channeled, in-molded EPS provides efficient cooling - Goggle compatible, 3-position adjustable visor - 360 Fit System allows you to dial in your perfect fit every ride - Weight: 380g Sizing - Small = 51 – 55cm - Medium = 55 – 59cm - Large = 59 – 63cm Certifications - CPSC - EN 1078 - AS/NZS 2063

Designed with input from our pro mountain bike athletes, the Speedframe Pro Klif Helmet has earned Virginia Tech#s best rating (5 STARS) in its Bicycle Helmet Ratings program for a reason. This top-tier open-face mountain bike helmet offers a market-leading feature set to keep you protected every time you hit the trails. Top of that list is Mips, designed to reduce rotational motion and redirect forces away from your brain should you crash. Dual-density Varizorb# EPS bumps up that impact protection further by spreading forces of impact across a wider area. The 360-degree fit system and Fidlock SNAP helmet buckle ensure a perfect fit every time you ride, with a buckle that's a cinch to open and close, even with gloves on. The XT2 liner is antimicrobial and manages odor while wicking moisture away from the head, and is easily removed and washed should it need it. Goggles pair well with the Speedframe Pro Helmet too, thanks to the 3-position adjustable visor. If you're looking for a performance-minded trail helmet, congratulations#you just found your new lid.

It doesn't matter if you're a casual rider or committed commuter. Stay safe and protect your head with an Electra helmet. - Durable ABS hardshell and EPS foam liner for maximum comfort and protection - Fit retention system with reflective bubble decal - Authentic Electra graphics - Secure magnetic Fidlock buckle - Heat sealed and washable padding liner for added comfort - Reflective straps - Size SMALL fits circumference 48cm - 54cm and hat sizes 6 1/2 - 6 3/4 - Size MEDIUM fits circumference 55cm - 58cm and hat sizes 6 7/8 - 7 1/4 - Size LARGE fits circumference 59cm - 61cm and hat sizes 7 3/8 - 7 5/8 - Small size generally fits children while medium and large sizes fit adults

Keep it safe with an Electra Commute MIPS Helmet. The perfect balance of form and function, these stylish and sleek helmets are our most advanced yet. - MIPS Brain Protection System - Boa System ensures easy adjustment and secure fit - Camera/light mount and reflective visor - Magnetic Fidlock slide buckle - In mold EPS with PC shell for maximum comfort and protection - Certified to NTA 8776 standard and is ideal for e-bike riders - Size small fits circumference 48 cm - 54 cm and hat sizes 6 1/2 - 6 3/4 - Size medium fits circumference 55 cm - 58 cm and hat sizes 6 7/8 - 7 1/4 - Size large fits circumference 59 cm - 61 cm and 7 3/8 - 7 5/8 - Small size generally fits children while medium and large sizes fit adults