Pack of 4 extra large, soft, FABRIC, medical alert patches for clothing that you can easily and quickly personalize with a permanent marker. Each fabric patch is approximately 6 x 5 inches. See all featured pictures. Designed and created by an autism mom, these sensory friendly patches work great on clothing for non-verbal kids or adults, who might be unwilling to wear a medical alert bracelet. You can easily sneak them onto the back of a shirt. No "papery" feel because they are made from 100% polyester fabric. The patches are water resistant, so work great in damp conditions. They are also re-usable. Many customers report getting 3-4 uses from each patch. You can peel them off of one garment and stick them onto another easily and quickly. Works great on the back of cotton shirt. They will not leave any sticky residue on clothing. Personalize patches with a permanent marker before applying to shirt. Peel off paper backing and apply to clothing. Not recommended for application to windows or other surfaces.