These Patches can be applied to denim, 100% cotton, and polyester/cotton blends on light and dark colored garments. They can be applied to robes, hats, bags, t-shirts, sweatshirts and so much more! Size (Approx) : 4.25 in x 2.25 in Backing: Iron On THESE PARTICULAR PATCHES CANNOT BE APPLIED TO ANY TYPE OF SURFACE THAT WOULD MELT WHEN HIGH HEAT IS APPLIED TO IT. The patches can be applied with an iron or a heat press.