New, two-piece (separate top and bottom) wetsuit, a complete set. Thickness: 3mm Material: 90% Neoprene, 10% Nylon Size: Men's L (Height 170-178cm, Weight 58-68kg) 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 just right in terms of width, and the length is a little short, but it doesn't affect use. The material is stretchy, so it's possible to wear it even if you are outside the "Height 170-178cm, Weight 58-68kg" range, but the following situations may occur: * If you are smaller, there may be more gaps between the wetsuit and your body, reducing heat retention. * If you are larger, the wetsuit will fit more snugly, but it may be more difficult to put on and take off.