The Alpha 4mm introduces an innovative approach to dive boot design that's sure to garner interest among temperature and cold water divers. Embracing the Sport Shoe concept, the Alpha boot utilizes a laced closure instead of a zipper. A unique two layer construction combines neoprene and nylong along with anti-abrasion fabric on the outside. On the inside, a Diamond Span lining improves warmth and comfort, plus diries quickly. The anti-slip sole provides security on wet surface, and additional protection is provided in the toe and heel areas.