304 GRADE, RUST-PROOF STAINLESS STEEL INSIDE- Made of the best quality, food-grade stainless steel our Hydra Trek water bottles are crafted to ensure the water inside retains a pure, clean taste with no chemical leaching. 20 HOURS HOT, 24 HOURS COLD- Keeps your drink cold for 24 hours or hot for 20 hours straight. Sip healthy with our BPA-free water bottles that are made with non-toxic materials. With our reusable water bottle, staying hydrated all day long just got easier. For the coldest drink, simply add ice cubes to your insulated bottle. EASY TO CARRY & USE, WIDE MOUTH -Pack your leak-proof, spill-proof and sweat-proof water bottle in your gym bag, travel backpack or purse. For your convenience, your stainless steel water bottle has a wide mouth that makes it extremely convenient to drink from. So whether you're outdoors or at your desk, our Hydra water bottles are the perfect hydration companion. COPPER COATED DOUBLE-WALL VACUUM INSULATION - The double wall vacuum insulation of the water bottle maintains the temperature of inside contents for hours and prevents condensation from forming on the bottles exterior. Warranty : The product comes under 1 year warranty by Borosil for any manfacturing defects. Note: Spare Parts are not covered under warranty.