Contigo AUTOSEAL West Loop Stainless Steel Travel Mug with Open-Access Lid, 16-Ounce, Silver/Blue, Set of 2 Patented AUTOSEAL lid is 100 percent leak proof and spill proof and offers convenient one handed drinking Vacuum insulated double wall stainless steel keeps beverages hot for 4 hours and cold for 12 hours Lid is top rack dishwasher safe while body is hand wash using non abrasive cleansers to preserve the painted finish Fits most standard car cup holders Made from 100 percent FDA-approved materials