100% Cotton Imported Triple-Layer Sweatsaver Halo Liner – Stay dry, comfortable, and stink-free with our exclusive Sweatsaver Halo Water Liner, made with three foam layers wrapped in ultra-soft, moisture-wicking fabric Dual-Density EVA Foam Protection: Interior headliner and top crown feature closed-cell EVA foam for superior impact absorption, enhanced durability, and a secure, comfortable fit that adapts to your head shape Durable High-Density ABS Shell: The outer shell is molded from high-density ABS thermoplastic polymer for long-lasting protection, rugged durability, and reliable performance; meets CE EN 1385 water sports safety standards Easy-Care Removable Liner: Convenient Velcro system lets you quickly remove the Sweatsaver Halo for easy washing and freshness between uses; paired with an adjustable chin strap and side-release buckle for a secure, personalized fit every time Available in Five Sizes: X-Small fits 20.1–20.5 in (51–52 cm), Small fits 20.6–21.3 in (52–54 cm), Medium fits 21.4–22 in (54–56 cm), Large fits 22.1–22.9 in (56–58cm), X-Large fits 23–24 in (58–61 cm)