THE PORTABLE CUP 30% Lighter, double wall construction, vacum insulation Double wall vacuum insuladed allow for hot teas,soups,coffee or other blends to remain consistenly hot for up to 12 hours. also, cold water,smoothies,soft drinks of anything you may need very cold, 24 hours of insulated confidence, guaranteed cold, period! 18/8 food grade stainless steel made from pure food grade,light weight,durable 18-8 stainless steel. the purest from of material to house liquids, hot of cold. Will not sweat the bottle will not “sweat”, meaning it will not create condensation which may leave a ring of liquid on your expensive buried walnut side table.