Abyss Tech 4mm Compressed Neoprene: Designed for rigorous technical diving. Built from 4mm compressed neoprene, this suit offers the technical diver reduced buoyancy and increased flexibility while retaining suit insulation properties. 4mm compressed neoprene with a highly abrasion resistant commercial nylon covering and a Thermalcote heat reflective layer Flexible YKK long life zipper Choice of kneepads - Kevlar or bonded rubber Demo models available at reduced price! Check out the size Charts!