Direct Thermal Labels for Mobile Printers in Zebra Z-Select 4000D Direct Thermal Material is a direct thermal, bright white, coated paper label for printing high-contrast, black, visible light images in cold temperature applications.  It has a special acrylic-based cold temperature adhesive that survives at temperatures as low as -65° F and applied at temperatures as low as -20° F.  Ideal for use with freezer-grade materials.  Not recommended for applications involving exposure to sunlight or extreme heat.