I'm super picky about materials. These are a new fav. I got them for post partum because I knew their stretch would accommodate for the journey as the belly shrinks back down. Ironically, I was still able to wear them with my full term belly too. My "non pregnant" stats when I'm in a size medium is ...5'3", and about 130-140. (Less than that I'm usually about a small in old navy). Currently full term I'm almost 180 which feels unreal. My husband claims I look "all belly". So, that should give you a good idea about the stretch since I can make them work now. Definitely looking forward to wearing them NOT pregnant though lol. A PS— I got the opaline and the turquoise blue (I forget the exact name). Because this material in lighter colors can show skin texture more, I loved that there was a tunic length dynamic fleece sweatshirt that came in the matching turquoise. Even in pregnancy, it covers my belly & butt perfectly. I wish they came out with an opaline (purple) option in the tunic too!