Our stainless steel collection features copper insulated, double wall tumblers. Drinks stay cold, when you want them cold, and hot when you want them hot. Either way, the temperature is maintained for hours. The double wall insulation means the outside stays cool and dry, with no condensation. We use a BPA free lid, with a sliding closure so you can take it on the go. The silicone seal means it stays put. Great for indoor or outdoor use, fits comfortably in a car cup holder. Buy for yourself or for a great gift. Hand wash only.