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. Sizes 4, 6, 8, and 10 also include easy-access ankle zips for even greater convenience.