Amazing heat and cold retention! Vacuum double-walled stainless steel tumbler 450ml Keeps warm things warm and cold things cold! Amazing heat and cold retention! Durable stainless steel vacuum double-walled construction! For iced coffee, the ice melts slowly, and the flavor doesn't get diluted, so you can enjoy it to the very end. Of course, it also keeps your beer delicious for a long time while watching baseball or soccer.