Norrona lightweight merino socks are made for mountain biking but work perfectly for all-season outdoor adventures and casual wear. The fabric is a 45% merino wool, 44% nylon, 8% multifilament nylon, 3% elastane mix. The premium merino wool is temperature-regulating, retains body heat while transporting moisture away effectively keeping you warm, even when wet, and is also natural odor-resistant. The nylon improves the durability at a low weight and has moisture-wicking and quick-drying properties. Norrona uses some elastane to make the socks stretchy, but limit the amount as this fiber absorbs a lot of moisture. The sock has a regular cut.