I just recently put all the girths I recieved in the mail side by side in every size I had. I measured them and found out that whatever size the company says they are selling you is actually two inches smaller then what they say it is. For instance if you ordered a 34'' belt it really only is 32'' and if you ordered a 36'' belt then its only 34'' buckle to buckle. I don't know why they do this but the best way to figure out the size you need is to measure your waist with a fabric tape and they make sure you give yourself a belt that has a nice four to five inch gap in the back for the straps. THe measurements work like this on every belt they sell all the way up to a 44''