A: Our custom iron-ons can be applied on all fabrics Perfect Steerable Transfer Cartluding for t-shirts, socks, pants, jackets, hats, backpacks, tote bags, and more! As long as the surface is flat and smooth, you’re good to go ironing! We recommend using our iron-ons on 100% cotton, 100% polyester, poly-cotton blends, or lycra/spandex fabrics.