NIRLON insulated bottles are made from 100% food safe, 304 grade stainless steel. The easy to use flask features a rust free, condensation resistant body with a sling cover for added durability and portability. The flip lid with a BPA free leak proof cap can be used as a cover making it ideal to store beverages for work, picnics or day long trips. The flask comes with an elegant matte finish and curved body. The contemporary design with a wide body and tapered mouth, makes it easy to clean and maintain.