Lavacore Unisex Socks - Great for Scuba Divers, Snorklers and Watersports Activities - X-Large Wind-proof middle layer provides anti-wind chill properties and ensures warmth in cold conditions Water resistant outer layer facilitates fast water run-off and quick drying Light weight and 4-way stretch makes Lavacore incredibly comfortable to wear Breathable middle layer allows moisture to be drawn away from the body on the surface Lavacore is neutrally buoyant