Very comfortable. I lived in these all summer and right up until my feet got frostbite and I was forced to go into socks and shoes. I would recommend anyone thinking about it to invest in a pair of Birks. Despite wearing them constantly there is no wear on the soles.
Once you get used to them these are very good for difficult feet. Cannot fault the service - delivered from Germany to Canary Islands in four working days. They don't actually look like clogs once they are on, my priority was comfort but in fact they look fashionable as well.
These slippers are so comfortable. So glad I bought them, can't complain about the price I paid either. It's like walking on air, when i'm wearing them. I gave this product the full 5 star because of the support on my foot.