This is the Bare 5mm S-Flex Unisex Scuba Diving Booties With Zipper Features: 5 mm S-Flex Boots Great for diving cold/moderate water temps Heavy-duty zipper with wide gusset and low placement for easy entry Reinforced toe and heel cap Durable non-slip vulcanized soles Rubber reinforced hook-and-loop zipper stop tab Heel fin strap retainer The 5mm S-Flex Boots excel in cooler water temps and are built to be at home on rocky shorelines, sandy beaches or slippery boat decks. Heavy-duty zips with wide gussets and low zipper placement makes for easy entry. A reinforced toe and heel cap-complemented by tough non-slip vulcanized soles-ensure long-lasting durability.