The Bell(R) Adult Sixer MIPS Bike Helmet offers ventilation, cooling performance, and durability like no other helmet. It features 26 vents with 4 brow ports, MIPS technology integrated into the Float Fit Race(TM) system, and quick-drying X-Static(R) padding. The Sixer is ready for action filled rides on the trails with its breakaway camera mount, goggle compatibility, and adjustable visor. FEATURES: Designed for mountain biking Multi-Directional Impact Protection System reduces rotational forces from certain impacts and offers more protection Float Fit Race(TM) is a lightweight system and has an easy to use turn dial that provides a broad range of vertical adjustments and padded width-adjustable cradles Ventilation: 26 vents with 4 brow ports Dual Flow Ventilation(TM) features air ports along the brow to help defog googles Exposed polycarbonate roll cage for highly durable structure Fusion in-mold polycarbonate shell with EPS foam liner provides strength and greater durability Progressive Layering(TM) offers variable EPS foam thicknesses to help manage the transfer of energy after impact X-Static(R) Padding is quick-drying, has real silver fibers, and prevents the growth of odor-causing bacteria and fungi No-Twist Tri-Glides(TM) has quick-adjust fasteners that help keep straps flat and in place Goggle Gripper features a strap at the rear to secure goggles in place Sweat Guide(TM) pad pulls moisture away from the brow pad and eyewear 4-Position adjustable visor simply adjusts with an up or down tug Integrated breakaway camera mount detaches upon impact to decrease injury Certifications: CPSC Bicycle, CE EN1078 Complies with U.S. CPSC Safety Standard for Bicycle Helmets for persons age 5 and older SIZING: S: 52 - 56cm M: 55 - 59cm L: 58 - 62cm XL: 61 - 65cm