I have an ass of thick booty girl and I'm a dude. I bought these because I was gaining wight ( hence my fat ass) and I couldn't fit in to any of my jeans now. I bought 5, four of them are L and one of them is XL. The XL was to big (I'm like 34-32, 190lb) so I just compared what I wear for shorts which is a large and bought four L and they fit good. Great for when I use my SkateBoard to Crooz. I imagin if you had a smaller ass it would be a little loser around the waist witch is fine. But for me I can even tie the laces together so there goes that. Overall great I like them.