My first pair were the chameleon 3's. I really found those to be very comfortable and a great casual walking, go anywhere shoe! I wore holes in both heels after walking about 600 miles on paved trails in about 6 months. They were such a great shoe that I thought I would replace them with the Chameleon 4's. So far so good! They are holding up well. Wish the 4's had the pull up tab on the tongue like the 3's. The stretch slip on design and glove like fit will keep me buying these for years to come.