Crashworthiness, not brittle to withstand the high intensity, strong foam density,Ultra-light, wind tunnel, duct design, effectively reduces wind resistance. * Use ONE STEP technical material, EPS increases impact resistance of composite materials. * High-qualityfoam layer,the adjustment within the twist, you can adjust the size of head circumference. * Suitable for people with head circumference 54-65cm and the head-width below 16cm. * Package includes:1 x Bicycle Helmet with Silver; 1 * Visor.