The backing you choose affects how your patch attaches and how permanent that attachment is. Iron-on backing is popular for a reason: it's simple, affordable, and works well for items that won't see heavy washing or wear. Just apply heat and pressure, and the patch bonds directly to the fabric.
Sew-on backing takes more effort upfront but is the most durable option long-term, which is why it's the standard choice for uniforms, jackets, and gear that gets used and washed often. Velcro backing is ideal when you want flexibility — patches can be swapped in and out easily, which is common for tactical gear, team jerseys, or seasonal branding changes.
Peel-and-stick adhesive backing is the quickest option, great for temporary use or smooth, non-fabric surfaces, though it's not meant for long-term wear. If you're not sure which backing fits your use case, think about how often the item will be washed, whether you'll need to remove the patch later, and how much durability you actually need — that usually points to the right choice.