The Wing Sleeves are developed to protect wingfoilers' knees from abrasion. The sleeves are especially beneficial to entry-level wingers who get up the board comparably often and thereby stress the knee area. Protecting your knees as well as your wetsuit from abrasion from the board's surface, the sleeves are lightweight yet resistant. The ION wing sleeves are built upon over a decade of expertise in mountain bike sleeve protection. Available in four sizes.