Thermaflect All in One Undersuit includes the Flectalon material which is a thermal insulation invented to give high performance, where effective thermal protection from extreme climatic conditions is the main requirement. The Undersuit includes multi-layers which entrap air and multiple reflecting surfaces to throw back body heat to the user. It is neither bulky or cumbersome and is easily cleaned using mild detergents in a quick 40°C wash. The Undersuit retains its insulative qualities when wet or compressed and the quilt construction retains thermal integrity throughout the life of the garment. Wearing it closest to the skin will reflect back the body heat quickly, clothing can then be worn on top of the suit if required. This product is also breathable and therefore prevents the huge amount of condensation that builds up when wearing a dry suit for example. The Undersuit is available in 5 sizes.