Nice and airy, I can only speak to my size 13 but it was snug and almost too small for me, the only real issue is that when the Velcro is strapped it folds the side of the shoe that points into the crank and rubs against it. I think it has more to do with the large size of the shoe and my foot shape, but Iβm not sure. My foot is comfortable though, Iβm in between a normal and wide and it works for me.