The Evolution Undergarment is designed for harsh climates. It keeps a diver warm in extremely cold waters, and protects the diver from wind and mist above the surface, yet is soft enough on the inside to be worn against bare skin. Ideal for use in waters from 37°F to 55°F. Outer rip-stop nylon shell stops wind Center 100g/m2 layer of Thinsulate™ provides warmth and wicks moisture away from the diver Internal 250g/m2 layer of technical fleece adds additional warmth and is extremely soft and comfortable Neoprene ankle and wrist cuffs allow easy drysuit donning and keeps moisture from insulation Arm vents allow perspiration to escape Neoprene crotch panel adds to flexibility of the suit Two-way convenience main zipper Zippered breast pocket Two fleece lined side pockets Comfortable ribbed collar Can be worn with any drysuit Machine washable Tog rating (measure of insulation value) of 3.5