Blue Boneyard Novelty Motorcycle Helmet with Skulls (Size L, LG, Large) Blue eagle boneyard novelty motorcycle helmet with skulls Fiberglass shell, Padded lining for comfortable fit Nylon Y-strap retention system and adjustable quick release chin strap Steel rivets secure Y-strap to shell, novelty helmets do not meet D.O.T. standards How to measure for a motorcycle helmet. Use a fabric tape measure and measure the distance around your head just above your eyebrows. Then select a size from these options, all sizes in inches . - XS 20 1/8" - 20 5/8 / SM 21" - 21 3/8" / MD 21 1/2" - 22 1/4" / LG 22 1/2" - 23" / XL 23 1/4" - 23 7/8" / 2XL 24 1/8" - 25" /