5 y 43 en zapatos y zapatillas, y un 44 en marcas como Salomon que son estrechos. It runs somewhat small. This is our second pair. Most comfortable slippers I have ever owned. Sad part was that I fell while wearing my headphones and dented and scratched them. If I intended to wear socks I probably would have gone for size 6 Amazing space saver! It makes me feel really glamourous and my husband loves it, and I have had lots of compliments about my figure when I go out in it. I bought them to use as anchor points on my minivan rear windows for lightly tensioned bungee cords, but one of them detached almost immediately, and the other detached after a few days. Couldnt purchase the set since it comes with single towel bar and not the double that I wanted.