Goodbye sweat! The double wall insulation makes the Iron Flask sweat-free! It keeps your drink COLD for up to 24 hours, and HOT for up to 12 hours. It will never leave a metal taste or rust. It assures that you stand out with a very durable and elegant bottle. Your logo is now LASER ENGRAVED to assure the highest quality as well. We guarantee that the high quality Stainless steel Flask bottle will surely please you!