Replacement anti-microbial, removable and washable liner for 100% Altec helmets, 100% Polyester. Designed for everyday use, this helmet liner delivers breathable, sweat-wicking comfort and reliable odor control. Removable for easy cleaning and maintenance, it restores a snug fit, cushions contact points and helps extend the life of your helmet. Available in thin and thick options to tune padding, fit and ventilation to your preference. Durable polyester construction holds shape and performance through repeated washings—great as a replacement or spare to keep your helmet fresh, hygienic and comfortable ride after ride.