12 to 12 1/2 inches long. Knit fabric. The Stay On Soc stays on your head even while sleeping. If you have been seeking a cap, wrap, scarf or soc that stays on your head even when you sleep, your quest is over. The secure tie feature ensures it stays on. If you are thinking, that is amazing..you should know it's also comfortable too. Best of all you can tie it off based on what feels comfortable for you. (standard 20 inch circumference around the head) Ships priority mail to addresses in the U.S.