Neoprene socks usually used for scuba diving, snorkeling, spearfishing, freediving and paddle. The purpose is to protect the feet from being cut by fins and keep them warm. And you can choose low cut for snorkeling and paddle, high cut for scuba diving and spearfishing. The Dive Socks regular for 3mm, 5mm, 7mm, 9mm. And Neoprene swim socks regular for 2mm, 3mm. You can choose according to your demands and interests.