HammerHead Tuff 3mm Socks- Made tough, durable, and strong. HammerHead Tuff Sox socks are designed with an extra long open cell seal and an anatomical cut around the ankles to prevent water from seeping in during the kick cycle. Durable strong pad soles, and toe edge with red HammerHead grip sharks are tough yet flexible ensuring maximum power transfer to the footpocket. Fully glued, blind stitched then neoprene taped over finish. With these features and qualities on these socks make them the ultimate freediver sock.