Kolpak is the cold standard for walk-in refrigeration and freezers. Kolpak's Polar-Pak coolers and freezers are made with the same rugged, high performance construction that has made Kolpak the leader in walk-in refrigeration. The Polar-Pak modular panels of 4" 100% foamed in place non-CFC urethane foam offer superior insulating capabilities. The exterior and interior of top-quality galvanized metal offer an attractive and rugged metal finish. Polar-Pak also offers superior air circulation around the coils making it both economical and efficient to run.