The Hydrapeak bottles have a double-walled exterior with a vacuum seal between the walls. This means your drinks will stay at its absolute temperature for hours. Cold drinks stay icy cold and hot drinks stay consistently hot. Our vacuum insulated water bottles work by creating a buffer between the liquid stored in the compartment and the external environment, keeping the temperature inside the bottle consistent; which also prevents condensation forming on the exterior of the bottle. In addition to keeping your drink at your desired temperature, vacuum insulated water bottles are safer than their disposable plastic counterparts. Our copper-coated insulated bottles keep liquids piping hot for 12+ hours or ice-cold for 24+ hours. The outside wall is made from high-quality, food-grade stainless steel. Our food-grade steel meets all criteria to be deemed safe for food preparation, storage, and dining. Stainless steel is so popular in the food industry because of its resistance to oxidization and corrosion. The inner wall, in the vacuum sealed area, is coated in a layer of copper for double added insulation – you’ll enjoy your drinks free without temperature, leaks, spills, metal-taste, flavor, and odor. Ideal size for everyday travel for all-day hydration, High-flow spout allows you to hydrate quickly. 100% leak-proof with sweat, and condensation proof finish. This is the exquisite sports, yoga, gym, and travel reusable fresh pure water bottle that meets your desired daily requirements. Also, makes a gift to remember for men, women, and children. It’s also made with BPA-free materials, keeping its contents safe to consume. BPA-free and also phthalate-free and made of hygienic food-grade 18/8 stainless steel. Hydrapeak hydration line of products is 100% free of BPA, BPS, and BPF.