20 oz. Insulated Travel Mug has been tested and compared for the best possible quality. They withhold cold for up to 24+ hours and heat for 12+ hours.
 
Material: Stainless Steel
 
Misc. Notes
- Double-wall vacuum insulation with a narrower bottom to fit most standard cup holders. BPA Free. 
- Not recommended for dishwashers, hand wash only. 
- Seamless construction so there is no leak point.