GD Signature Series H: 12oz Double Wall Glass Tumbler/Mug with Removable Strainer and Spill-proof Mirror Cap BPA free Perfect for Iced Tea, Icy Cold Drink or Hot Tea and Coffee Double wall glass protects hands from heat while keeping the temperature. (Note: It doesn't keep hot for hours like Thermos) Double wall glass prevents water rings on the table! Ultra clear glass shows the natural color of the drink. Removable/Adjustable strainer, with BPA Free Spill-proof mirror surface cap, and Body-Made of high grade borosilicate glass. Stainless steel infuser.