Beware. Web site says 11-11 1/2 and "runs large." I wear different Birkies that are size 44 and fit perfectly, company sent me size 42 (for the 11-11 1/2). way too small even though I typically wear 11 1/2. I have tried to re-order one size up but to get the color I want, the conversion offers only size 43. No 44 available, apparently. I'll look elsewhere.