Pentashell THERMAL:Bridges the gap between the rash guard and wetsuit. It is warm like a thin wetsuit and flexible like a rash guard. Use our surf suits alone, or wear it as a base layer under a wetsuit for enhanced heat retention in colder temperatures. Neoprene & Adhesive Free:Made eco-friendly, entirely free of neoprene and adhesive. Lightweight and Warm:Unique double-layered weaving offers effective temperature isolation while measuring just 1mm thin. Comfortable and Flexible:Four-way fabric stretch, soft to the touch.High collar and thumbholes Convenience:Reliable YKK front zipper, easy entry and exit.Flat-Lock Stitched Seams is excellent durability and fantastic comfort.