Thermal insulation and assembly
3 mm neoprene.
The seams of the gloves are waterproof due to GBS assembly (Glued and Blind Stitched): the neoprene is glued first of all, then sewn for maximum strength (the sewing needle does not go completely through the neoprene in order to prevent water infiltration).
The palm of the hand is reinforced with Supratex for added grip.