The unique process of pasteurizing milk at an ultra high temperature, and then packaging it in the tetra pak shelf safe 6 layer carton (aseptic 6 layer packaging - paperboard, made from wood from selectively harvested, regrown trees, is used to make the package stable, yet lightweight. Thin layers of polyethylene - a common plastic - are added to seal in the liquid and protect it from external moisture. A thin layer of aluminum foil protects products from oxygen, flavors and light. ), results in milk that is shelf safe. Shelf safe milk is what the industry calls uht or ultra high temperature, meaning that the milk has been pasteurized at a higher temperature, but for a shorter time, to preserve taste and nutrition. Aseptic 6 layer packaging. Unit size - 1 liter