C4 Carbon - 0.5 mm Open Heel Socks depth which means you can tighten

which means you can tighten the sides to lock securely in any position

For regular depth training

5 mm neoprene for more toe-area volume than 0

Weight Capacity: Up to 26 lbs (12 kg)

C4 Carbon - 0.5 mm Open Heel Socks depth which means you can tightenC4 Carbon 0. 5 mm Open Heel Socks The C4 Carbon 0. 5 mm Open Heel Socks are ultra thin neoprene socks designed for freediving foot pockets. They add a light protective layer between your foot and the fin without significantly changing the fit. Use them when your fins already fit well, but you want less rubbing, fewer pressure points and more comfort during pool training, depth sessions or long open water dives. The 0. 5 mm thickness is the key point: