Xcel Men's Axis Back Zip Full Wetsuit 4/3mm Affordable Warmth and Comfort . If you’re looking for enhanced warmth and stretch at a great price, Xcel’s Axis, with its easy-access back zip design, is an excellent choice. It features a 100% performance stretch exterior, Ocena®, a neoprene-free, bio-based foam, and a ThermoLite Infrared (TDIR) interior chest panel for added warmth. The Axis’s engineered fit allows for easier entry and improved performance. Materials It features a 100% performance stretch exterior, Ocena®, a neoprene-free, bio-based foam, and a ThermoLite Infrared (TDIR) interior chest panel for added warmth. Specs 100% Super Stretch Thermo Dry IR insulating chest upper body Triple glued and blind stitched sealed seams Reinforced Fusion X stress points Engineered Fit to maximize comfort and performance.