Ready to Press Printed Sublimation transfer - 400 degrees for 50 seconds with a heat press (required). Medium pressure. Testing is always recommended to achieve desired results due to variations in paper, ink, heat press and atmospheric conditions. Heat tape is recommended to prevent shifting or ghosting. Sublimation must be pressed on at least 60% polyester and a white or very light colored garment. A shirt with 100% polyester will give the most vibrant look. The lower the polyester count the more faded/vintage the image will appear when pressed. Sublimation prints do not print white areas. The white areas will take on the color of the garment. Image sizes are based on longest length of the design for the appropriate imprint area… Mug/Cup 3” Infant 4” Toddler 5” Youth 8” Adult 10” Sublimation and heat transfers are non-refundable due to the numerous conditions and variances in application, heat presses, inks, paper and more. Irons & Cricut Easy Presses will not work with sublimation.