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. "Wide" model: wider than the basic version, but still not suitable for very wide feet. - Wateproof Gore-Tex membrane - 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® Megagrip rubber outsole provides gri