(20 inch head circumference) 14 to 14 1/2 inches long. Knit fabric. Arrives complete with matching face mask as shown. The face mask is adjustable and washable. Please Note: These masks are not designed to be used in a medical setting. The stay on soc is closed on the end. This means you can wash and wear your mask over and over. The Stay On Soc stays on your head even while sleeping. If you have been seeking a cap that stays on your head, 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.