The MJF Corkcicle Tumbler is perfect for the slow sippers. The vacuum-sealed tumbler is BPA free and crafted from stainless steel with proprietary triple insulation. Drinks stay ice-cold for 9+ hours or hot for up to 3 without freezing or sweating. Add ice to your cold drink to extend the 9-hour threshold even longer! The design is slip-proof, with a silicone bottom, easy-grip sides, and a sliding, spill-resistant lid.