Patagonia Yulex Water Heater Hooded VestDesigned for comfort under your wetsuit, this hooded vest is an easy way to add extra warmth on those icy days. Made with Natural Rubber Stretchy 85% Yulex natural rubber 15% synthetic rubber by polymer content; the natural rubber is Forest Stewardship Council certified by the Rainforest Alliance; the synthetic rubber is chlorine free Thermal Lining in Hood Thermal hood lined with a warm and stretchy solution dyed 95% polyester (51% recycled) 5%