Some of us simply get colder than others. We are not sure what the science is behind it but it seems some people can wear shorts in the snow, have never owned a warm coat and frankly don't care about the cold. Good for them. Others of us need all the help we can get and Orca's Thermal 3mm, 100% neoprene swim cap is a great way to build up your confidence to get in the open-water or stay in there for longer. It has an adjustable chin strap as well as coming in two different sizes which helps to ensure the perfect fit and a relaxed and comfortable swim without irritation. So get out and enjoy the open-water without feeling like your extremities may well freeze off!