Crafted from a merino wool rich blend, these SmartWool Hike Light Crew Socks will keep your feet warm and cosy as you hit the trail. The light, half-cushion is perfect for moderate hiking or aggressive walking, while the arch brace holds the sock in place and adds additional support. The socks boast a flat-knit toe seam that will ensure comfort for mile after mile. Side guide: S = 2 - 4.5 M = 5 - 7.5 L = 8 - 10.5