High quality 2 to 4 mm Neoprene rubber. No fabric surfaces! Rated to a depth of 35 m for diving. One side is the color listed, the other always black neoprene rubber. This orange is a special high-visibility orange.
Neoprene is top quality rubber material (chlorine butadiene rubber - CR) that maintains it's properties trough time. Inside Neoprene there's homogeneously spread air bubbles that provide thermal insulation and elastic structure.
Made in Germany.