Got an XL for myself. I’m 5’11, pushing about 200 lbs. Super soft fleece on the inside, smooth cotton on the outside. Medium weight with a relaxed fit. The only problem was that it was waaaaayyyy too small in the butt. Skin tight and gave me serious plumbers crack. I’m a female with no shortage of backside btw.... I ended up giving these to my dad who is a couple inches shorter and a few pounds heavier (with no butt whatsoever) turns out they fit him great.