Brand new two-piece (separate top and bottom) 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 (see images 9 and 10). I personally use this wetsuit for diving. It's made of a softer material compared to other wetsuits, making it comfortable. I am 180cm tall and weigh 65kg, and I wear a size L. The fit is good in terms of width, and although it's a little short in length, it doesn't affect its use. The material is stretchy, so it can be worn by people outside the "Height 170-178cm, Weight 58-68kg" range, but the following situations may occur: * For those smaller than this range, there may be more gaps between the wetsuit and the body, reducing heat retention. * For those larger than this range, the wetsuit will fit more snugly, but it may be more difficult to put on and take off.