The Sistema Hydrate stainless steel bottle is perfect for school, work, sports and picnics to keep hydrated on the go. Simply fill the 600ml bottle and close the leak-proof screw-on lid. The stainless steel bottle has been designed with double wall vacuum insulation to encapsulate beverage temperatures for longer, keeping them hot up to 6 hours and cold up to 12 hours. Made from high quality stainless steel that will not rust over time.