I’m usually in between a S-M and I went with the S for these pants. Fit me perfect and the waistband leaves room if desired. My biggest issue with joggers can be the amount of room in the crotch, and this style has more room than I normally prefer compared to the traditional joggers on this site (I ordered three different kinds). However, that can be a good thing for someone caught in between sizes! I work as a physical therapist, and I will be ordering more of these. Also loved the grey/blue color, had many compliments from patients!
Got them in the navy and they are perfect. 100% recommend. Very similar to lulu joggers but better priced!!