US sizing. Hoka One One's award-winning Speedgoat shoes have been named after Karl "Speedgoat" Metzler. Speedgoat shoes are made for fast pace trail running on technical terrain. This version number 6 is a bit lighter than version 5, but more importantly, the underfoot feel has been tweaked on step away from plushness, and towards a more responsive running feel. The surface fabric is more breathable than before and the tongue is padded more, for extra comfort. As many other trail runners, the Speedgoat is also great for walking-paced activities. - Regular last - The updated mesh upper provides breathability - 3D printed overlays provide additional midfoot support and lockdown for a more secure feel - The gusseted tongue features strategic cutouts for breathability - Lacing eye-rows contain a small winged component to ensure a secure fit - Midsole features a new lightweight foam for a more responsive ride - Wider forefoot offers a more stable ride and accommodating fit - Vibram® M