Review on BALEAF Men's Mountain Bike Shorts: 3D Padded Cycling Biking Shorts for Loose-fit MTB - Lightweight & SPF 50 Protection by Brad Lovro

I think they fit true to size. I have large quads and hips and currently wear a 34" and the L is a little big if anything, so I'll be ordering a medium as well to try. I think if you are 36" or so L will do, 38"+ will probably need XL, otherwise it's fantastic and great value for money. Fit well, very comfortable on a ride I did today, did 15 miles cross country and really helped save my butt so I'm very happy with them. The drawstring is also good for tightening them when needed.