ColorSpark premium HTV is preferred by both DIY crafters and professional designers making custom t-shirts, hats, apparel and more. Voted One of the best Heat Transfer Vinyls on the market. ColorSpark offers fantastic quality, unique finishes and durability. ColorSpark offers hundreds of bold color combinations and finishes. Available in UV color-changing, Opal, Soft Metallic, Soft Holographic, Flash Reflective, Blast Reflect, Reflective Glitter, and Glow-in-the-Dark finish series.