The ultimate thermal protection for open water swimming, the Zone3 Neoprene Swim Cap provides warmth while maintaining good hydrodynamics through the water. The Zone3 Neoprene Swim Hat is worn under your normal latex swim cap to give you extra insulation.

They're very effective at preventing 'brain freeze' when you jump into cold water and should be a standard item in every triathlete's and open water swimmer's kit bag. It has a velcro strap which joins under the chin to ensure the optimum fit and 4mm neoprene to keep you warm in cold water.