I usually very comfortably fit into xs but these fit tightly which is surprising for maternity leggings (I had followed the sizing guidelines). We'll see if the fit relaxes a bit after a few washes. As other reviewers have remarked, the seam on the waistband is quite thick and feels a bit hard. On the up-side they feel very supportive. The fabric is also of quite a thick weight so best for spring/fall rather than summer.