US sizing. Hoka's ATR or All TeRrain shoes have been very popular for trail running, harder surfaces, fast hiking and other activities. As is typical of Hoka trail running shoes, they will probably try to rob the title of your favourite shoes. Compared to version 6, this version number 7 has: - Lower overall weight - Renewed, simpler surface fabric - Renewed, softer shock absorption - Thicker midsole - Grave tyre inspired tread, with smaller and denser lugs in the center and larger, rougher ones on the sides Other characteristics: - Gore-Tex Invisible Fit membrane: waterproof - CMEVA midsole - 4 mm tread pattern