I typically purchase a size small in most underwear except for these.  I was told by other reviews that they run on the small size into order one size larger so I purchased aMedium. And according to the size chart a medium fits 32 to 34 inch waist.  I have a 3031 inch waist and I typically wear a pant size 3030. The medium fits well and I don't have to worry about washing them and hand drying them because I ordered a size larger case they shrink in the wash.