Triple Wall Insulation: Raymylo 40 oz Modern Insulated Water Bottle featuring copper plated triple wall vacuum insulation, is tested to keep your drinks icy cold for up to 36 hrs and reassuring warm 18 hrs. Get this iconic water bottle to up your fitness track, you'll fall for hydrating as every sip is absolutely cool Made with high-quality, food-grade stainless steel, this water bottle is BPA-free, ensuring that your drinks remain safe and healthy. The triple-wall insulation technology keeps your cold drinks icy cold for up to 36 hours and your hot beverages steaming hot for up to 18 hours. Our Insulated Water Bottle is the perfect companion for all your outdoor activities, sports, and travel adventures. Whether you're hiking, camping, biking, or simply running errands, this bottle will keep your drinks cold or hot all day long. The leak-proof design ensures that you can toss it in your bag without worrying about spills, and the durable construction means it can withstand any rough handling. The sleek and stylish design is perfect for on-the-go use and fits comfortably in most cup holders. The wide-mouth opening makes it easy to add ice or clean the bottle, and the durable construction ensures that your bottle can withstand any adventure. With this Hydro Water Flask, you'll have a reliable and stylish hydration solution that will keep you going all day long.