Merino wool is a butter-soft natural fibre from Merino sheep. It's thinner and softer than regular wool, making it easy to wear next to the skin. Wool holds heat even when it’s wet so it’s an excellent fibre for winter socks - or year-round for the times you step off the hiking trail and into the creek. Light grey knee high socks with woven blue and tan micro-thin stripes on the calf, and blue toes, heels and XTF logo on the ankle. Graduated compression with arch support, seamless toes and 7/8 inch wide comfort band. The inner wrapper has tips for wearing and washing. Wear these socks hiking, for snow sports, and under your dress pants or in your tall black boots when out for dinner. Materials: 32% Merino Wool, 31% Bamboo Rayon, 32% Stretch Nylon, 5% Spandex Compression level: 15-20mmHg. Small-Medium size fits calves measuring 9-15 inches, Women's shoe sizes 5-10 and Men's shoe sizes 6-9. Large-ExtraLarge size fits calves measuring 14-19 inches, Women's shoe sizes 10-12 and Men's shoe sizes 9-12. Please visit the additional listing if you need this larger size.