Unmatched Warmth and Comfort. The Thermo Flex series is Xcel's warmest, lightest, and most comfortable dive suit in our line up. Featuring the Thermo Dry Celliant (TDC) next to the skin liner with Smart Fiber Technology and Ultra-Span outer fabric. This proven technology recycles your body heat into infrared energy for greater warmth, increased endurance, faster recovery, and enhanced overall performance. The multi-density vented hood has a GlideSkin face seal and a comfortable contoured chin. Completely sealed seam construction, compression resistance eco foam, and our latest Channel Flex stretch make this vest the highest level of Warmth and Comfort.