I previously wore the PureFlow 5 and absolutely loved the tight/snug/stiffness of the shoe. This new version (6) is a bit less stiff and a bit less snug in the toe box, which is fine. Because of this there was less of a "break in" period. I run about 15 miles per week give or take 5 miles. My feet supinate when I run and these work well for me. These shoes, as were the previous version, are best for running and not walking. The snug fit makes walking not as comfortable, but I love this shoe for running or HIIT. The tongue is also shorter in this version so it doesn't rub against your ankle less version 5 did if you wore no-show socks. Overall I still love the PureFlow. I hope these last just as long as the 5's!