Worlds Greatest Pop-pop - grandfather nickname - Best Granddad - Grandpa appreciation gifts Iron on Heat Transfer is a great way to jazz up a plain T-shirt, pillow case or any other light color fabric. The transfer is transparent and should be applied only to white or light colored material suitable to withstand high heat. Available in 6", 8" and 10". Color not true until transferred; home iron instructions included. Wash inside out using mild detergent and dry on low heat.