Durable 18/8 food-grade stainless steel will not absorb odors or stain. Double walled vacuum insulation layer and insulated cap. Copper wall layer keeps surface of the bottle free from condensation. Keeps beverages sealed and at the optimal temperature. Drinks stay cold up to 24 hours and hot up to 12 hours. Colorful exterior is scratch resistant. Hand wash only. 17-Fluid ounce capacity.