Insulated water bottles made of food-grade stainless steel, anti-oxidation and corrosion resistance, will never leave a metal taste or rust. Avoid the taste of the liquids to change (like tea, coffee, and juice). Touching the lid of the cup lightly to display the current water temperature. Featured dual walls, premium coated in the exterior of the inner wall. High-performance temperature retention, keep liquid hot for up to 12 hrs and cold for up to 24 hrs. The BPA-free silicone rubber on each lid ensures no leak and no plastic smell. Perfectly suitable for daily use, running, hiking, camping, etc.