I'm between an 8.5 and 9 and bought a 9 to accommodate thick socks. Walked ten miles a day for three days in a row and didn't have a blister or a rub. A few days in light rain with no water intrusion in a mild climate. Last day on muddy trails and good grip. I didn't love the way they looked but the trade-off in utility made up for it. Light weight. Heading to Montreal in late March and I think these will be great with the addition of shoe warmers (HotHands Insole Foot Warmers) on cold days. Happy with the purchase.