3 mm neoprene.
The seams of the gloves are waterproof due to GBS assembly (Glued and Blind Stitched): the neoprene is glued and then stitched for maximum resistance (the needle does not go all the way through the neoprene to prevent water getting through).
The palm of the hand is reinforced with Supratex for added grip.
Choose the right size
Try on your diving gloves. The tightest possible fit is required for optimal thermal insulation, like a second skin.
These scuba diving gloves provide thermal protection that has been tested by the independent INPP institute (Marseille, France) in order to validate their compliance with the current standard (EN 14225-1:2017)