Thermos Stainless Steel Vacuum Insulated Tumbler With Slide Lock Lid 710ml White is designed for extended hydration with premium Thermos™ vacuum insulation technology that keeps beverages hot for up to 7 hours or cold for up to 18 hours under typical conditions. The 18/8 stainless steel construction is durable, BPA-free, and sweat-proof, while the slide-lock lid helps minimize spills during commuting or office use. The large 710ml capacity is ideal for coffee, tea, water, and iced beverages. Preheat or pre-chill the tumbler before filling for maximum performance, hand wash after each use, and avoid microwave use.