For size 11 they're way too small and narrow, almost 1 inch shorter than my Champion slippers size 11.<br /><br />Update: July 9. Just got a replacement size 12. It barely fits. These slippers made in China for European market, not US, and they're mislabeled. Original pair size 11 had #44 (European size) printed on the bottom. According to size chart, that's US size 9.5. Size 12 pair had #45 (US size 10.5) printed on the bottom. They're uncomfortable to wear for an extended period of time because massaging spikes are too hard and it almost hurts. Therefore, I change my rating to 1 star.<br /><br />P.S.<br />These are also sold as EasyUSA brand of massage slippers.