Fetures:-Keeps beverages hot or cold for longer hours.Copper coating for better heat retention.Designed with a compartment to keep sugar cubes, medicines etc.100% rust free steel.Milton Insulated Steel Bottles are a part of the Thermosteel Range. Its unique temperature retention mechanism keeps your beverages hot or cold for longer hours. This bottle is extremely slim and compact and would fit easily into the side pockets of your bags. The Milton Thermosteel Optima has a special compartment for keeping sugar cubes, medicines etc.