These Crew-Length Classic Cotton Socks are made for men with sensitive skin or allergies. Made of premium Lisle Mercerized Cotton for comfort, with a 1% nylon reinforced heel and toe for strength, they are the perfect natural socks. 100% Cotton Classic Men's Dress Sock is available in these four different sizes for a better fit: Sock size 10-10 1/2 fits shoe sizes 6 1/2 to 8 1/2. Sock size 11-11 1/2 fits shoe sizes 8 to 10 1/2. Sock size 12 fits shoe sizes 10 to 11 1/2. Sock size 13 fits shoe sizes 11 to 12 1/2. 10-10 1/2 may be marked 10 & 11-11 1/2 may be marked 11. ***NOTE: These 100% Cotton Classic Men's Dress Socks have an elastic top. If you need the Comfort Top Non-Binding Cotton Socks used by many diabetics and people with poor circulation please order style AI-8302.