DOT Red Boneyard Motorcycle Half Helmet with Skulls (Size XS, X-Small) DOT red boneyard motorcycle half helmet with skulls Helmet Meets and Exceeds D.O.T. Safety Standards. FMVSS 218 Helmet has Screwed on Removable Visor with a Comfortable Liner Helmet has Adjustable Chin Strap for Secure Fit 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" /