Brave the icy waters with Ultrawarmth Base Layers featuring Celliant® Infrared Thermal Technology? FDA-determined as a heat recovery medical device. Designed to replace the older SB System base layers, Ultrawarmth seals in warmth and creates a protective heat barrier so divers can stay warmer for longer, even during their most chilling adventures. Advanced stretch breathable fabric draws moisture away from the body and creates a dry zone, next-to-skin barrier, while moisture is dispersed over a larger surface for quick evaporation. Power every dive with Ultrawarmth protection.