VACUUM INSULATION: Vacuum insulation technology Keep your favorite beverages at the most suitable temperature all day. Keep cold for 24 hours and heat for 12 hours. Even if the water bottle is filled with ice or boiling water, the outer wall of the water bottle will not sweat or heat PERFECT SIZE: Our slim 17-ounce water bottle is very convenient to carry around, it can fit most cup holders, leak-proof and spill-proof flasks, keep cool wherever you go Hold the compact bottle comfortably in your hand, or conveniently pack it in a bag or purse. STAINLESS STEEL : Water bottle made of high quality stainless steel, safety and durable. So it wont rust or leave a bad metallic smell in your mouth, and the electrolytically brightened inner wall is very easy to clean. COLOR POWDER COATING :PBA-free fashion color powder, the coating formed after electrostatic adsorption and baking at 300 C will not be scattered, discolored, and difficult to scratch. The exterior features of the product provide extra grip to the cup, making it easy to carry any outdoor activity with you.