From Tilos, X-Lycra Skin Sock That Goes Everywhere: Snorkeling, Beach Sports, Volleyball or Hanging Out.
Tilos - 2.5mm X-Lycra Skin Sock Features:  Top quality material and construction for durability Neoprene sole with lycra and adjustable cuff  Protects feet from hot sand, mud, blisters and sunburn  Super lightweight, weighs less than 1 lbs (.45kg)  Improves performance for beach volleyball, sand sports, snorkeling Perfect for poolside or at the sandy beach