THREE SIZES: US women's shoe sizes 5-6.5 (8.5"-9.05"). US women's shoe sizes 7-7.5 (9.25"-9.38") and US women's shoe sizes 8-10 (9.5"-10.2").MATERIAL: 71.5% Cotton / 24.7% Polyamide / 3.8% Spandex. Washable. quick dry and breathable.NON-SLIP SILICONE: Cotton no show socks with 5 silicone heel grip technology ensures non-slip and your no show socks stay put all day long.LOW ENOUGH: Almost invisible for most casual/athletic shoes. Great for Running. Yoga. Pilates. Workout. Daily Wear and other Indoor & Outdoor activities.BREATHABLE & SKIN CARE: High quality cotton no show socks are made thin. lightweight and breathable to give extreme comfort. You'll forget you are wearing them.