This is a new, two-piece (top and bottom separate) wetsuit set. Thickness: 5mm Material: 90% Neoprene, 10% Nylon Size: Men's L (Height 170-178cm, Weight 58-68kg) Elbow and knee areas are reinforced. (Images 9 & 10) I personally use this wetsuit for diving. Compared to other wetsuits, the material is softer and more comfortable. I am 180cm and 65kg, and I wear a size L. The fit around the body is just right, and the length is a little short, but it's fine for use. Since the material is stretchy, people outside the "Height 170-178cm, Weight 58-68kg" range can also wear it, but the following situations may occur: - For those smaller than this range, there will be more gaps between the wetsuit and your body, reducing heat retention. - For those larger than this range, the wetsuit will fit more snugly against your body, but it will be difficult to put on and take off.