18/8 Stainless steel double wall insulation keeps beverages cold or hot. Fits in car cup holders for easy on-the-go use. Slim body design allows for easy gripping. Screw top lid. Wash before first use. Dishwasher safe (top rack), hand wash recommended. Not intended for carbonated liquids. Use caution when consuming or transporting hot liquids. Not for use in freezer, microwave, or ovens. Keeps hot for 12 hours. Keeps cold for 48 hours. 17 oz