The 20 oz. Tied Tumbler from ASOBU is a double wall vacuum insulated 18/8 stainless steel tumbler. It keeps drinks hot up to 12 hours and cold up to 24 hours. It comes with a transparent, spillproof, adjustable lid. With its black color and modern upscale look, the ASOBU Tied Tumbler it is the ultimate tumbler. Details: Black 20 oz. capacity Transparent, spillproof, adjustable lid Double wall insulation Made with 18/8 stainless steel