Double layer vacuum insulation keeps your beverage hot or cold Keeps drinks cold up to 30 hours and hot up to 12 hours 18/8 Stainless steel structure is sturdy and durable Sweat-repellent powder textured external surface for better grip BPA-free Volume: 21 oz. Material composition: Stainless Steel, Polypropylene, Silicone More Info Sport: Outdoor Product code: 090497872174 Columbia Stainless Steel Insulated Water Bottle (620ml)