Mares Classic 3mm Dive Boot These are extremely good quality for a very low price! The neoprene around the ankle is made of super-elastic material to create an exceptionally comfortable fit. The lower section, is made of standard neoprene to ensure warmth and adherence. There is a rear notch for securing your fin strap in place. Side zipper allows easy donning and doffing of this boot. Incorporates enhanced shape and design features for Mares’ classic boot style. Ergonomic fit for comfort during extended use. Soft, leveled sole.Wide toecap.