Arctic IceA(R) Tundra SeriesA(R) Ice Packs are designed to maintain a "freezer-like" temperature in coolers. The innovative panels are filled with a unique, high-performance phase-change material that cools at 5AdegF. This unique material absorbs heat instead of the frozen items in a cooler with higher melting points, keeping frozen items frozen. Rugged, UV-stabilized color container 5 degree cooling point Non-toxic materials Reusable Maximum surface area for faster cooling Leak-proof, ultrasonic spin-welded cap Size option of 0.75 lb., 1.5 lb., 2.5 lb., 5 lb. and 10 lb. Made in the USA