US sizing. While the Clifton is a "middle of the road" choice in the Hoka lineup in terms of cushion, Hoka's style always involves a relatively soft feel. This model is a popular choice for base endurance runs, as well as brisk walking. This ninth version differs from its predecessor by: - Lower overall weight (ok, we're talking about four grams, but still) - 3 mm bigger stack height - More responsive cushion at front, while softer at the heel - Simplified upper textile - New outer sole Other characteristics: - Narrower last - CMEVA midsole - Meta-Rocker structure offers a great rolling stride - Front stack 27 mm, heel stack 32 mm, drop 5 mm