100% STAINLES STEELS Double Wall Construction Unbreakable.Double vacuum insulated wall construction allows for hot teas, soups, coffee or other blends to remain consistently hot for up to 8 hours. Also, cold water, smoothies, sofe drinks or anything you may need very cold, 20 hours of insulated confidence. Guaranteed cold Period! 18/8 Food Grade Stainless Steel 30% Lighter Strong as ever.Made from pure food grade, light weight, durable 18/8 stainless steel. The purest from of material to house your liquids, hot or cold.Will Not Sweat Vacuum Insulation : Keeps to temp all day. 8h Hot 20h Cold , The bottle will not" sweat", meaning it will not create condensation which may leave a ring of liquid on your table.