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 Please allow an additional 5 shipping days for Mares items as they are very popular