The Southern Ocean Boot: complete attention to detail tailored towards the most punishing environments on the planet. The highest possible content of natural rubber ensures unyielding waterproof protection. For exceptional comfort and warmth, a hardwearing 3mm neoprene lining and an integral fabric gaiter prevents water entering the boots. A superior outsole compound delivers superb grip and traction on-deck while safeguarding. Designed, developed and tested by Volvo Ocean Race Sailors in the Southern Ocean. Swete Sailng recommends these for any cold offshore race.... for guaranteed dry feet, rubber is the only way to go. Look to use these boots alongside the Pro Lite SDL rubber shoe ie. when its hot, use the SDL to give your feet an air out. A size bigger then you think is always worth a shout as you could be wearing these with thick socks.