FEATURES: Mountain biking helmet Fusion in-mold polycarbonate shell the helmet's outer shell to the EPS foam liner to create a sturdier helmet Wraparound, easy 2-click removable chin bar Progressive layering with variable EPS foam densities helps better manage the transfer of energies after some impacts Overbrow ventilation features intake ports on the brow of the helmet to usher in cool air and push it through the air-channel matrix for full-head ventilation Minimalist and lightweight Float Fit(TM) system with an easy-to-turn rubber overmolded dial for adjustments Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and Older TECHNOLOGY: Equipped with MIPS(R), the Multi-Directional Impact Protection System, so you not only stay cool but stay safe with extra protection and durability Goggleguide(TM) adjustable visor accommodates both goggles and glasses Sweat Guide(TM) pad design pulls moisture away from the brow pad and eyewear Spherical Technology(TM) helps redirect impact forces, bringing market-leading design, performance and brain protection together without compromising comfort, ventilation, weight, or style Spherical Technology(TM)'s ball-and-socket design helps redirect impact forces away from the brain by allowing the outer liner to rotate around the inner liner during a crash SPECS: S: 20 in. - 21.75 in. / 51 cm - 55 cm M: 21.75 in. - 23.25 in. / 55 cm - 59 cm L: 23.25 in. - 24.75 in. / 59 cm - 63 cm Weight: 640 g