Superior protection, cool, comfortable all around awesome! So whats really unique about this helmet? Well that is, besides the one of a kind look! The various sizes actually are based on different sized shells, this means a superior fit for you without excess 'stuffing'. When we say it is among the lightest in its class we mean it! Less is more!! It uses a new EPS liner: this awesome technology allows less padding in the helmet with the same amount of protection. -DOT Approved -Lightweight Durable Outer Shell -Special protective EPS liner -Removable Visor -Stainless Seal Dual D rings. -One year manufacturers warranty SIZE CHART ADULT SIZES INCHES CENTIMETERS XS 20 1/4 - 20 7/8 52 - 53 S 21 - 21 5/8 54 - 55 M 21 3/4 - 22 3/8 56 - 57 L 22 1/2 - 23 1/8 58 - 59 XL 23 1/4 - 24 60 - 61 XXL 24 1/8 - 24 7/8 62 - 63