Quick rundown: run slightly small, just slightly. (I'm 6' and wear 36 in pants - XL RS) Dear Sugoi: get rid of the elastic/gel grippers. Those are the ONLY complaints. Durable and bad to the bone chamois. I have 2 pair (so far) and these are my "go to" bibs for long hauls. I have some other brands and high-end models that are plenty good, but the RS is the way to go for mileage. I'm in Austin and these can beat the heat and the vents on the chamois are not a gimmick. The logos are some type of iron-on junk and won't make it 2 washes, but who cares? IF (and I doubt you will,) return them realcyclist is painfully simple and fast to work with. In the words of Arnold,..."Do it now!"