Abstract: Thermal insulating underwear for divers is made from plastic laminated material with insulating gas-holding bubbles uniformly disposed over an inner surface. The materials are formed in a tube and edges are joined to form clothing. Gas trapped in bubbles throughout the clothing spaces a diver's suit away from a body, preventing heat loss by relatively efficient conduction, and providing gas-filled spaces which ensure relatively inefficient heat loss from a diver's body portions, including extremities.