The full zip design allows you to zip up for 100% warmth and protection, or zip completely down when the sun comes out, your work rate goes up or just for ease of getting on and off. It also has a high collar to keep your neck warm. Titanium garments are windproof, lightweight, neutrally buoyant and provide the warmth of a 4 to 5mm traditional wetsuit. Ditch your old wetsuit or layer for extra insulation in cold waters.