Stay hydrated and energized during your outdoor adventures! 20 oz. Nasia Vacuum Tumbler is made of 18/8 stainless steel liner with copper coating vacuum sealed for insulation that keeps your drink cold up to 24 hours or hot up to 12 hours. Comes with stainless steel straw with silicone for sipping your favorite beverages conveniently. Ideal for traveling, camping, hiking, or everyday use. Imprint drinkware only can be handwash. BPA FREE, FDA certified