These socks are made of comfortable polyester fabric, breathable, moisture-wicking, and providing non-slip surface of the sock bottom. Features: Highly elastic, soft, moisture-wicking and comfortable for all seasons. Reinforced heel and toe areas are thicker for extra durability and comfort. Arch support adds stability to reduce foot fatigue. Elastic cuff keeps the sock from sliding into the shoe. Nice for running, cycling, mountaineering, hiking, skiing and other outdoor activities. Specifications: Material: Cotton + Nylon + Polyester Color: White & gray / Black & green / Black & red / Dark blue / Fluorescent green ( optional ) Size: M / L ( optional ) Packing Size: 28 * 16 * 4 cm / 11.0 * 6.3 * 1.2 in Packing Weight: 75 - 85 g / 2.6 - 3.0 oz Package List: 1 * Pair of Socks