PRICES MAY VARY. TRIPLE INSULATION TECHNOLOGY: Each 64Hydro tumbler has double-walled, vacuum-sealed and copper-coated insulation, which helps keep drinks cold for up to 24 hours & hot for up to 12 hours. CONSTRUCTED OF 18/8 STAINLESS STEEL: Known for its strength and purity, our 18/8 food-grade tumbler won’t break, rust, retain or transfer flavors. Unlike other tumblers, our tumblers provide a clean, non-metallic taste. ANTI-LEAK, BPA-FREE FLIP LID: Each tumbler comes with an Anti-Leak, BPA-Fre