URBANE O2 Double Wall 18/8 Stainless Steel Insulated mug15 Ounce (Black) Double wall stainless steel vacuum insulation keeps beverages hot or cold for hours Durable and sanitary 18/8 stainless steel Wide mouth opening, 15 Oz Compact design takes up minimal space while maximizing capacity Leak resistant,BPA and Phthalate free. A perfect gift for friends and family