DuraPrint technology makes the glasses chip-resistant, peel-resistant, and dishwasher safe. Quiet, non-slip base prevents noisy slips and slides. The sliding 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 be careful with hot liquids). Fits into most cup holders for on-the-go convenience, making it the perfect stainless steel travel tumbler for coffee. Durable 18/8 stainless steel construction with copper lining that does not retain flavors or odors. Do not soak or use aggressive cleaning materials (such as bleach, chlorine, etc.) Do not put in the freezer or microwave. d.