DOT Vented White Full Face Modular Motorcycle Helmet (Size S, SM, Small) DOT pearl white full face modular motorcycle helmet with air vents and push button front release. Meets and exceeds DOT safety standards. FMVSS 218 Helmet meets and exceeds D.O.T. safety standards. Lightweight shell design. Flip up face shield or a push button opens the entire front. Flow through ventilation system and anti fog system. Moisture wicking removable and washable interior. 100% UV Protection. Removable padded ear panels for communication speakers. Padded chin strap and free helmet bag, removable tool-less shield. Scratch resistant coated shell. 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 1/4 - 20 7/8 / SM 21 - 21 5/8 / MD 21 3/4 - 22 3/8 / LG 22 1/2 - 23 1/8 / XL 23 1/4 - 24 / 2XL 24 1/8 - 24 7/8 /