Premium flask is made of high quality stainless steel- Fully insulated, double walled & Vacuumed for better temperature retention- Retains temperature for up to 6 hours. Light Weight, Easy to carry, Unbreakable Stylish water bottle. Convenient for Gym, Sport, Cycling, etc. If you are a coffee lover and you care about the hot liquid of your coffee, this flask is just the right one for you. Printed with Modern and Unique Designs to make the Special Appearance adding to the Style of the Flask. 500 ml, Light Weight Great Color Combination and Vacuum Air tech. to utilize the Best of the Inside Vacuum to keep the Drinks Hot and Cold.