The Dysprosia is a twin sided reversible strap. Both sides are made of the same quality velours bovine split, mineral tanned, in assorted colors. The leathers softness gives this strap a great comfort, beyond expectations. A layer of non-woven tear-proof adhesive material is between the two leather sides. The Dysprosia is one of Constant Bourgois's fanciest straps. Various length adjustment options.