TriMaxT technology using triple wall insulation. Double stainless steel walls with copper coating for maximum temperature retention. Vacuum sealed. Keeps hot for 20 hrs and cold for 100 hrs approximately. Thermal properties unmatched by any other thermos. Metal lid with foldable hidden handle and inner thread for quick and easy opening and closing with a turn and a half. BPA free material. Non-slip base. Smooth and comfortable drinking edge. Ice cube and cup holder compatible. Includes individual box.