These shoes are so comfortable I bought a second pair, a larger pair to wear with socks and a smaller pair to wear without socks. They really don't let my feet air out. I wore my first pair almost every day for a month with no problems except one: squeaks. I could easily get rid of the noise. I noticed that there is a hollow circle in the center of the sole that creates suction on a hard floor. I took a utility knife and scraped off some of it to get rid of the circle and the problem was solved. I also bought a pair for my son who prefers to wear boots but loves the lightweight material and will be wearing them this summer.