Top quality materials and construction for durability: Neoprene sole with lycra upper, adjustble cuff * Protect feet from hot sand, mud, blisters, sunburn * Improve performance for beach volleyball, sand sports, snorkeling * Size XXS: Mens/boys US 1-2.5 (Womens 1-4). Size XS: Mens/boys US 3-5 (Womens 5-7). Size Small: Mens/boys US 4.5-6.5 (Womens 6.5-8). Size Medium: Mens US 7.5-10 (Womens 9.5-12). Size Large: Mens US 10.5-12. Size XL: Mens US 12.5-14. Size XXL: Mens US 14.5+