PATENTED AUTOSEALA® LID AUTOMATICALLY SEALS BETWEEN SIPS TO ELIMINATE SPILLS AND LEAKS. DOUBLE WALL VACUUM INSULATED STAINLESS STEEL KEEPS BEVERAGES HOT FOR 4 HOURS OR COLD FOR 12 HOURS. EASY, ONE-HANDED USE WITH NO CAPS OR SPOUTS. COMPLIES WITH FDA, PROP 65. 7 7/8" H X 3 1/2" DIAMETER