4mm Olive Mesh Neoprene, an extremely durable and strong fabric. Seams are sealed and double taped for extra strenth. Large neoprene straps for comfort with large buckles for easy adjustment. Large front pocket with velcro flap to store valuables in. There is a hand warmer built in behind the pocket to keep your hands warm on cold days.There is also a inner pocket to keep your phone and wallett dry. K Tough urethane knee pads for added protection keeps you dry up to your chest while fishing. Warm, comfortable and buoyant. Great for cold climates. Used extensively by Government Departments.