HEATSTORE TECHNOLOGY: Absorbs energy, bringing your beverage to the perfect drinkable temp in minutes and adds warmth back to your drink to keep it at the perfect temp for hours. LEAKLOCK: Leak-proof lid is engineered to not leak, drip or spill. EASY SIPPING: Unique, ergonomically designed lid with easy one-handed open and close for sipping on the go. DURABLE STAINLESS STEEL: 18/8 stainless steel resists scratches and dents for all of life’s adventures. EASY TO CLEAN: Dishwasher safe and BPA-free.