The Santi Flex 2.0 heating undersuit is designed as part of complex Santi heating system which consists of such items as heated undersuit or heated vest, valve thermoconnector or thermovalve and external battery. This configuration allows a diver to use the heating system without necessity of using any additional valves and without any dangers associated with internal battery canisters. While using the same inner heating technology as in BZ400 heated model, this undersuit is light and flexible, which improves divers flexibility and bulk comfort under a drysuit. Made of high quality Climashield Contour fabric with weight of 180g/m2, allows for full flexibility of fabric in every direction, which leads to unique mobility and less bulk when compared with BZ400 Thinsulate insulation. The undersuit contains very efficient heating wires that provide optimal thermal comfort during long and cold dives. In this configuration, most of the generated heat is passed on directly on the divers body.