EUC No rubbing on the inside. I only wore them a handful of times so didn’t change the arch or wear of the sole. Please read below about size! These are youth size 7 so women’s size 9. I loved the color but only found them in the kid’s section Everyday speed for future flyers. What kid doesn’t want to go Mach speed? Our thoughts, exactly. Delivering the same snappy ride as our adults’ style, the kids’ Mach 6 is light, fast, and undeniably comfy. A lively pavement pounder geared to go the distance, we’ve cued up a 44% recycled woven upper, cushy 50% sugarcane EVA midsole, protective toe cap, and Durabrasion rubber outsole that’s thicker than our adults’ version for the extra durability your kiddos need.