These patches come with a backing that allows the patch to be ironed on for permanent adhesion. If you are attaching the patch to something you will be washing frequently, you may also wish to stitch around the edges to improve the lifespan of the patch. Please check the fabric you are attaching to for ironing temperatures. Adhesion is less likely with fabrics that have an uneven surface or a fluffy/furry texture.
Patch size is approximately:
Small: 7.8cm x 5.3cm (3 x 2.3 inches)
Large: 10.5cm x 7cm (4.1 x 2.7 inches)