DuraPrint technology makes tumblers chip-resistant, peel-resistant, and dishwasher safe. Quiet, nonslip base prevents noisy slipping and sliding. Slider lid is BPA-free, leak resistant, easy to open and close, and easy to clean. Triple insulation reduces condensation and keeps drinks hot for up to 8 hours or cold for up to 24 hours (always use caution with hot liquids). Fits most cup holders for on-the-go convenience, making it the perfect stainless steel travel tumbler and tumbler for coffee. Durable, copper-lined 18/8 stainless steel construction won't retain tastes or odors. Stainless steel tumblers feature a limited 2-year manufacturer guarantee.