The RoToTo Zero Day Hike Trek Crew Socks will have you covered adventures such as long-distance trail hiking or climbing. TheRoToTo Zero Day Hike Trek Crew Sock is based on the original RoToTo Hiker Trash sock and is constructed using shrink-proof merino wool yarn and nylon yarn. Toned in olive green with a charcoal toe and a red cuff, the sole of the foot uses a pile knit for extra comfort and cushioning for long days on the trail. The three-dimensional knitting in the heel and the arch support construction will keep the sock in place through any kind of vigorous activities you might undertake. The design is completed with a carabiner with a carabiner hole, to hang the socks for drying.