High-stretch Terraprene neoprene insulation made from limestone and recycled tires Titanium laminate adhesive reflects heat back to your body, keeping you warmer Full-zip entry with a durable YKK zipper Eco SupraTex reinforced seat and knees 2 mm high-stretch panels in the shoulders and behind the knees for ultimate flexibility NRS Men's 3.0 Ultra John Wetsuit - When the surf is up and the temps are down, find maximum comfort and warmth in the premium NRS Men's 3.0 Ultra John Wetsuit. Graphene, a graphite-based interior fabric, provides next-level against-the-skin comfort. This quick-drying fabric layer also provides added insulation.