Hotfix letters are a type of decorative embellishment that can be easily applied to fabrics using heat. These letters come with a heat-activated adhesive on the back that melts when heat is applied, allowing the letters to securely bond to the fabric. Hotfix letters are available in a variety of colors, sizes, and fonts, and are perfect for adding personalized messages, names, or designs to t-shirts, hats, bags, and more. They are easy to use and durable, making them a popular choice for DIY projects and customizing clothing and accessories.