I bought this product to use under my wet suit, when it start to be colder.Works very well, provide good warmthI m 5’11, and 220 lbs (31 inseam), I got XL which fit great. The legs are perfect length, it is a bit tight around the butt, but this is what you want, as it will loosing up a bit when wet.The loop for the feet is really useful to put this on.