The sock should sit snugly on the toes and forefoot so it stays in place when entering the foot pocket

but foot length is more reliable than shoe size alone

especially in the pool

Kaluna Freediving carries a selected range instead of every possible colour

choose a full sock or reassess the foot pocket size

Double K - System One Diving Backpack Bi-Fins The sock should sit snuglyDouble K System One Diving Backpack PRE ORDER NOW! (delivery ~ end. August) The Double K System One Diving Backpack is a large, stylish freediving gear backpack for divers who want to carry fins, wetsuits, masks, snorkels and accessories in one clean setup. This is not a small daypack and not a basic mesh bag. The System One is designed as a high capacity diving backpack with enough space for serious freediving equipment including up to two full sets