Large: Shoes size 6-10; X-Large: Shoes size 10-14 Made from yarn woven Viscose Derived from Bamboo, the toe seams are flat and well-made. They are elastic to fits a wide range of foot sizes perfectly. The fabric is lightweight, breathable, moisture-wicking, and breathable to keep your feet cool. Viscose Derived from Bamboo is softer and more comfortable than polyester or cotton, thin and breathable, you won't go back to cotton after wearing Bamboo-Viscose. Suitable for many occasions formal & informal Machine Washable Best socks to keep feet cool and dry.But Please feel the sock, its much more soft and silk like feeling than cotton sock. The fiber is Silky, you could tell is Bamboo-Viscose not cotton. How The fiber made: Cut Bamboo-Viscose into pieces, boiling and hammer into filaments; Bio-enzymes to obtain the cellulose fiber; Cleaned, bleached, softened the fiber for spinning. SERISIMPLE Men's Dress socks are made of high quality yarn and exquisite craftsmanship, the fabric is soft, comfortable and stretchy to wrap your feet well. 90% Viscose Derived from Bamboo Absorbs Moisture Provides long-lasting comfort that keeps feet dry even in extreme heat, sweaty workouts, construction work and/or high-intensity work throughout the day. Perfect elasticity in the welt and arch ensures that these dress socks stay in shape and fit, durable and comfortable. Keeping your feet odor-free even after wearing them all day. Machine wash and tumble dry for easy care. The fabric is soft and comfortable and retains its softness even after multiple washes. Please choose the right socks size according to your shoe size. SERISIMPLE is specially flattened for a comfortable fit. The heel is rounded for gentle support and a comfortable fit. Each pair of SERISIMPLE socks is proudly crafted by skilled artisans and then carefully inspected to provide customers with the best possible quality.