Comp X 4 3mm Chest Zip Fullsuit DLA Supply Chain Alliance Conference and Exhibition. Xcel Men's Comp X 4 3mm Chest Zip Fullsuit Wetsuit High Performance Infrared Warmth The Comp X is the warmest of the Performance Series, with a Channel Flex exterior for maximum stretch, and our exclusive Thermo Dry Celliant (TDC) infrared interior that penetrates deeper into the body's core for added warmth. The Comp X is completely sealed seams, with a one piece front and back panel design that is engineered to fit.