I have an 8.5 American men's sneaker but I have a 9. The tongue of the shoe doesn't stretch so it's a bit difficult to put on and take off, but once fully on they're quite comfortable. I also bought a pair of neoprene socks to wear with it and was still able to put my shoes on when I got dressed. The material of the shoe seems to be quite durable and I don't think I'll be too concerned about protruding debris. The soles are super sticky and I feel like a tree frog walking on a wooden floor, so the grip is pretty good too.