I have worn the Chaco Men's Z1 for about 4 years and have finally worn them out, so I thought I would try the Z2. They just don't work for me. The strap around the toe chafes and because I wear socks with my sandals (it's Portland, Oregon, so...) having the toe loop under my sock wasn't comfortable. I wore them for about 3 hours and decided to return them and get the Z1 again - which I absolutely love. The Z2 is a great sandal for those who never wear socks with their sandals and have calluses on their big toes from similar sandals/thongs, so I'm not putting it down, it is just that it doesn't work for me.