Water sports helmet for kids, youth, and adults with impact-absorbing EVA foam for protection; ideal for wakeboarding, waterskiing, inner-tubing, and other water sports Includes stink-free, moisture-wicking, three-layer foam Sweatsaver Halo Water liner and adjustable chin strap with side-release buckle Outer shell is molded from high-density ABS thermoplastic polymer; meets CE EN 1385 water sports safety standards Available in five sizes: XS fits 20.1-20.5 in (51-52 cm), S fits 20.6-21.3 in (52-54 cm), M fits 21.4-22 in (54-56 cm), L fits 22.1-22.9 in (56-58cm), XL fits 23-24 in (58-61 cm) To determine proper size, measure around head with a soft tape measure or string; manufacturer%92s 180-day limited warranty