Portable Hot & Cold Water Jug Preservation Efficiency : hot above 55'c (8 hour) cold below 16'c (8 hour) Material : inner aluminum Body : steel Cover : pp plastic EASY TO TAKE OUT & PUT IN BY OPENING THE COVER WITH TWO SMALL CUPS DURABLE,CLEAN & EXQUISITE PU FOAM INSULATED TO KEEP COLD & HOT FOR LONGER TIME CONVENIENT USAGE