Constructed with a high-quality blend of 79% Egyptian cotton, 20% Nylon, 1% lycra. Egyptian cotton is one of the finest and most durable cotton varieties and possesses a soft yet dense texture for perfect fit and temperature regulation. Detailed with a ventilated top, arch support, and an impact-absorbing cushioned sole. This sock will help take the damage so you can push yourself harder. All Pantherella socks have fine-linked toes for seamless comfort and reinforced heels and toes for durability. These types of details make these socks great for long-term wear like long workdays, traveling, or just for hanging out. Pantherella provides a simple size guide to help you find your perfect fit. Medium fits US 8.5 -11 foot and Large fits US 11.5 - 13 foot. Pantherella makes it easy to identify your match so it's one less thing you have to stress about. Pantherella is the premier hosiery and sock brand since 1937. Luxury, heritage, and expertise make Pantherella your number one choice in exquisite handcrafted English socks.