They are also easy to get on and off. I purchased this for my teenaged son to do pull-ups. I wish the toes fit to my toe shape better. Aber wenn es einmal lädt, verrutscht es auch nicht! She has plenty of room. Basically, buy these if you are looking for great noise cancellation on your headset. It smells lovely and it works great. Very comfortable in the ear, and touch controls work well, easy to use. Here is a link to what appears to be the Birkenstock UK website page about sizing. I ordered two different styles as well but they were both the same on his feet, so they all had to go back and we had to go to a skechers shop and pay a lot more than amazon.