These eye patches are made of mulberry silk and spinning cotton, smooth and soft surface makes you feel very comfortable and relaxed. Comes with a elastic strap, you can adjust the head strap size to fit your head circumference, Adjustable head strap,easy to use:Fully adjustable strap from 14 inches to 25 inches.Suitable for most head size and easy to use. Both the pink and black eye patch size is(Approx): 9.5x7.5 cm/3.7x2.9inches, training the lazy eye to work properly, so that vision can develop correctly. Wide application: these soft eye patches fit for one eye care and shield, without excitant, avoid causing skin irritation, especially good for amblyopia strabismus. Can be used over and over again. Hand wash in cold water with soap to clean. Reusable,eco-friendly and no Adhesive Eye Patches.