Henderson 3mm Thermoprene John3mm Thermoprene John One of the most versatile systems in wetsuit design, the classic john and jacket combo gives divers the option of layering up for cold waters are using a single layer in warmer climates. The base layer of this combo, the Thermoprene John is prized for its durability. High quality seam construction includes a sealing layer of GBS glue that prevents water seepage and boots warmth. The abrasion resistant Thermoprene material wears