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. Charcoal grey knee high socks with woven white and black micro-thin stripes on the calf, and black 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, or under your dress pants. 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. Please visit the additional listing in my boutique if you need this smaller size. Large-ExtraLarge size fits calves measuring 14-19 inches, Women's shoe sizes 10-12 and Men's shoe sizes 9-12.