Ultrawarmth OmniredTM Infrared Thermal Technology is integrated in the inside fabric of the Ultrawarmth Boots. OmniredTM is FDA-approved and scientifically proven to conserve body heat and speed thermal recovery. These easy-to-wear boots keep water out, protect your feet from sharp objects, and keep your fins from blistering. Its heavy-duty sole has been put to the test in the wettest situations to ensure support when walking on wet surfaces such as boat floors, to and from dive locations, or for shore diving. They fit all types of lower leg shapes and sizes thanks to a heavy-duty zipper and broad gusset, as well as ELASTEK full-stretch neoprene around the ankles and calves. Ultrawarmth Boots come in a variety of thicknesses and styles to fit any wet diving gear.