Dual-certified skateboard helmet with high impact-absorbing EPS foam, thick dual-density soft foam, and plush moisture-wicking Sweatsaver fabric Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older and ASTM F-1492 Skate safety standards Includes two different size sets of Sweatsaver pads to customize fit; pads fit very snug when they are brand new, and expect to wear for a couple of hours before the helmet is completely broken in Available in four sizes: XS/S fits 20 – 21.25 in (51 – 54 cm), S/M fits 21 – 22.5 in (53 – 57 cm), L/XL fits 22.5 – 23.5 in (57 – 60 cm), XL/XXL fits 23.5 – 24.5 in (60 – 63 cm) To determine proper size, measure around head with a soft tape measure or string; liners should be used to further customize fit; manufacturer’s 180-day limited warranty