These were a gift, but they didn't quite fit right on me (I should have gotten a Large!). I'd rather they go to someone who will wear them often and take advantage of how cozy and warm they are! They are a size Small, which should accurately fit shoe size 7-8.5. From the Bombas website: Description Everything you want in a grippy house slipper and more. More cushioning, thanks to an extra thick footbed that makes every step pillowy soft. More warm coverage, thanks to a fluffy sherpa lining that extends above your ankle. And more cozy style, thanks to the chunky yarns and oversized ribbed cuff, which look festive, textured, and cute to boot. While our grippers are pretty good at helping prevent slips, they’re not magic. So be careful, and practice good coordination out there. Full Fabric Content Gripper Slipper Bootie (Sherpa-Lined) : Shell - 56% Cotton 30% Acrylic 8% Polyester 6% Nylon , Lining - 100% Polyester Imported Care Details Machine wash cold on gentle cycle, Only non-chlorine bleach when needed, Tumble dry low, Do not Iron, Do not dry clean