Rooster Hot Legs - a revolution of heat - A layer of 0.5 mm of titanium allows for a product that is both comfortable and warm. Worn under normal sailing clothing, it allows for a greater amount of heat. Remember: The number of layers is more important than the thickness. Titanium neoprene works like a thermal blanket: the titanium-impregnated reflective layer is sandwiched between the neoprene and the nylon inner lining. This layer reflects the radiation emanating from the body and returns it.