DYNAMIC NORD BOOTS BG-50 5MM BLACK5 mm limestone bifurcated neoprene boots to protect you from the cold and for a perfect fit with the fin These boots have a rigid 5 mm sole and a zip on the inside side with a safety lock. Reinforced toe, instep, and heel offer greater protection The rubber heel block prevents slipping of the fin strap The molded rubber soles are very strong and anti slip and protect the feet from sharp rocks and steep surfaces