2 mm neoprene.
The neoprene sections are sewn together and slightly overlapped, without having been previously glued. Water therefore seeps through the seams. An ink zone is printed under the sole to increase the strength and grip of the socks.
How to choose your size
Try them on with your fins. The fit should be as tight as possible.
Weight of a pair of fins (size M 9/9.5 / EU 42/43)