Meets or exceeds DOT standards. The smallest DOT 3/4 shell helmet ever made. With four different shell sizes you are sure to get that proportional fit. Clear UV finish. Includes a headscarf (valued at $5.95). Comes with a glossy black bubble visor (valued at $4.95). It also comes with a cloth drawstring bag. Nylon strap system. Available only with Snaps. Fiberglass shell: stronger, lighter, safer. c1gmg measuring your head is a starting point for the entire sizing procedure. Due to the different head shapes, they are apparently the same size when measured by a tape may not necessarily fit the same size helmet. A cloth tape measurement can be used to make your initial size. The circumference of your head should be measured at a point about one inch above your eyebrows in the front and at a point at the back of your head which results in the greatest extent possible. Take several measurements to ensure that you has the largest one.Please note that this is not a rough and exact guide. The shape of the head is as important as the measurement which may affect the final fit. The following sizes are an approximation and are based on average. Head sizes may vary in some cases. Size 2 8"-20" 20 1/8" – 21 – 21 1 1/8" – 22" 22 1 1/8" – 23 23 1/8" – 24 24 – 25' 25 1/8' – 1 1/ 8 25 3/4' 25 7/8" - 26 1/4 Hat Sizes 5 3/4 - 6 6 1/8 - 6 3/8 6 1/2 - 6 5/8 6 3/4 - 7 7 – 7 1/4 7 3/8 – 7 5/8 7 3/4 – 8 8 – 8 1/8 8 1/8 – 8 1/4