Patagonia R3 Yulex Regulator Split Toe Wetsuit BootiesSO SO SO Warm, comfortable and durable, these wetsuit booties are made from stretchy 3mm 85% Yulex natural rubber 15% synthetic rubber by polymer content, with an internal split toe design for increased control and grip. These are UK Sizes Best for water temperatures: 4855 F 913 C. Perfect for the Irish Winter. Made with Natural Rubber Stretchy 85% Yulex natural rubber 15% synthetic rubber by polymer content; the natural rubber is from sources that