Double Wall Vacuum Insulated – provides maximum temperature retention of both hot and cold beverages. Up to 6 hours hot and 24 hours cold. High-Grade 18/8 (304) Stainless Steel – highly durable and corrosion-resistant. Copper Plate Insulation UV Tint Slider Lid DuraGrip Powder Coat Finish – our proprietary finish is both ultra-durable and provides a textured surface for a sure grip. Sweat Free Exterior BPA Free