DOT White Vented Motorcycle Half Helmet with Neck Liner (Size S, SM, Small) DOT white vented motorcycle half helmet with zip out neck liner and removable visor Helmet Meets and Exceeds D.O.T. Safety Standards. Super light weight, Approximately 30 oz. Smallest construction Free Helmet Bag and Owners Manual included. Quality Plush Interior. Removable visor. Face Shield Compatible Stainless Steel Dual D-rings adjustable chin strap. Durable exterior finish. Air vents for cooling. 1 year warranty. 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 /