This form-fitting fly mask is made of fine mesh with a comfortable lycra material that stretches to easily slide on and stay on all day long. The stretch fit also removes the need for zippers or other fasteners that can rub and come loose. Complete with fine mesh ears for full protection. Sizes to fit most horses.6" long ears, 30" nose; Stretchy material for adjustable fit. Sizing is Small/Medium, and Large/X-Large