20 oz Rover Tumblers

I bought the Mammoth Tumblers for the guys on my crew. They are well built and work as advertised. What impressed us the most was how well the lid works. From keeping your coffee hot, to having an ice cold drink. It even has a port for a straw.
If you are in the market for a great tumbler, don't hesitate buying the Mammoth. You won't be disappointed.