This is the third pair of Olympus I have bought.  This pair has no heal slippage but is slightly smaller in the toe area. I think they added more padding and the result is a smaller toe box. I like the shoe but I was unable to place my alternative insole into the shoe. The Olympus shoes are EXTREMELY padded and have no heel.  This works well for people with forefoot pain. I have only walked in these shoes but I am able to walk all day.