I wore these indoors for about 10 minutes, twice. The size varies slightly depending on the shoe, but I usually wear shoes in the 21.5 to 22.5 cm range. I chose size 22 cm, so these are for people with small feet. My feet are small, but they are quite wide, which is why I'm selling these. I think they would fit anyone with normal feet without any problems. Please note that these have been inspected and stored by an amateur, so please refrain from purchasing if you are overly concerned about minor details. Please message me before purchasing.