Unmatched Warmth and Performance. The Drylock series is the warmest, most comfortable suit in the Xcel lineup, made for the most extreme of conditions. This series offers water-tight construction with unparalleled warmth. The Drylock offers Celliant Black in the Core, Ultra Stretch infrared to maximize performance, and Channel Flex exterior to create the highest-level warmth and performance in our 5/4mm hooded wetsuit.