Heat press platens for a shoe customization/decoration system and a method of using the same are disclosed. The platens may be quickly interchanged to allow the same equipment to be used to dye shoes of different sizes. The platens individually accommodate a pair of assembled shoes and are shaped to: reduce print sizes, maintain symmetry and flatness of the shoe, and accommodate a range of shoe sizes. The size and shape of the platens enable one shoe to be fitted on one side of a platen and another shoe to be fitted on the opposite side. The platens position the shoes so that they are mirror images of each other. This positioning allows a single print, including mirror images of the same design, to be applied to two shoes at the same time.