The back features a fun fabric postcard theme printed on 100% organic cotton sateen. You'll need to provide your own decorative/embellished postcard front. Included are double-sided, heat-fusible foam padding and high-resolution peel-and-stick envelopes for mailing protection. Design the front with your own design, then heat-fusible, sew, and mail! Alternatively, you can place the decorated postcard/transparent envelope inside an opaque/paper mailing envelope for added protection.