Here at Arctic Tumblers, our mission is to sell temperatures. Whether you want the ice to last in your iced tea, or need your early morning coffee to stay hot until the afternoon, our mission is to keep your drinks the right temperature for as long as you want. We take our drink-temperature mission seriously, and our tumblers are the single best way we've found to serve this mission.
We make Arctic Tumblers with literally no insulation. That sounds odd, right? Well, it turns out that a vacuum is an incredible insulator. So instead of using more common glass or foam insulators, we insulate our tumblers with nothing at all - not even air.
A great tumbler needs to stand up to your daily use without affecting how your drink tastes. That’s why we took that clever vacuum technology and put it into a BPA-free stainless steel jacket. Specifically, Arctic Tumblers are made from 18/8 grade stainless steel, which is the very best of food-grade stainless steels; it’s found in professional kitchens everywhere, and also found in our Tumblers.
The "18/8" in our stainless steel grade stands for the metal composition. Stainless steel of an 18/8 grade is an alloy comprising 18% chromium and 8% nickel. The nickel improves strength (we've actually stood on our upright tumblers to test them for strength) and the chromium prevents the stainless steel from oxidizing (rusting). The thermal efficiency of an insulator is measured by units called "Watts per Kelvin-meter", commonly called the k-value. It's essentially a measurement of how quickly heat can travel through a mass, so the lower the k-value, the better the insulator. Glass insulation has a k-value of 0.04, foam insulation has a k-value of 0.03, and a vacuum wins the contest easily with a k-value of 0.00 - that's a perfect score, and that's the reason our tumblers are vacuum-insulated.