I suggest staying true to size regardless if it feels short or snug at first wear. After breaking them in they WILL stretch and mold to your feet, the inner lining will settle. If you're wearing socks with these, they're going to get even smaller in your true size and you're going to want to size up based on that. I highly suggest letting the slippers stretch and mold to your bare foot/toes at first wear or two and then wear socks if you'd prefer. The more you wear and stretch them to become personalized to your feet, the comfortable they get. Despite my advice, I personally can't recommend these because of the low heel lip and the heel slippage when I walk and it's only going to be worse if you size up. It slips out regardless if I'm wearing socks or not. I found that the men's soft perforated fabric version does not cause heel slippage for me and maybe it's in my head but I honestly think the men's heel lip is actually a smidge higher than the women's. If you struggle with in between sizing in women's, try the men's version converted to your woman size. It's the perfect "shmedium" fit lol
