Thermal insulation and assembly
5 mm neoprene.
The seams of the boots 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).
A latex sole: this increases comfort when walking, robustness and, therefore, the lifespan of the product.