Innovative Designs Inc offers the Arctic Armor Hood with Insultex, for added protection on those extremely cold and windy days. Used separately, or in conjunction with the Arctic Armor suit, the Arctic Armor hood reduces heat loss through the head. Head heat loss is usually less than one-third to one-fifth of total heat loss. Head heat loss is usually less than 20-30 percent or so of total heat loss. Head heat loss changes with how cold it is. The lower the temperature the higher the percentage. Head heat loss is linear with temperature. At 0 degrees Centigrade, up to about 30 to 35% of heat could be lost through your head at rest.