Listing is for Zamp FS-1 helmets. The FS-1 helmet features a light weight composite fiber shell, fully ventilated and adjustable front, top and rear exhaust vents, shield with positive ratcheting system, a moisture absorbent washable/removable inner liner, and a D-ring strap fastener. Helmets meet Snell M2000 rating. These helmets are new and are remaining inventory from my kart shop that I had for 15 years. If you have any questions, feel free to ask. Item will ship promptly. For sizing, measure 1/2" above eyebrow and ear or largest part of the head with a soft tape measure. Please measure several time to decide on the proper sizing. Extra Small - 21.25" 6 3/4 hat size Small - 22.00" 7 hat size Medium - 22.83" 7 1/4 hat size Large - 23.62" 7 1/2 hat size Extra Large - 24.40" 7 3/4 hat size