Orca - Thermal Neoprene Swim Cap - BlackWhy We Love It Cold water swims are tough enough without losing heat through your head. The Orca Thermal Neoprene Swim Cap makes winter ocean sessions and chilly mornings far more enjoyable. Comfortable, secure, and designed for long sessions, it is a go to for open water swimmers, triathletes, and athletes training all year round. Talk Nerdy To Me This Orca Swim Cap is made from 3mm of neoprene with an internal thermal lining designed to retain heat