Hands-down, the best tumbler money can buy. The SMART MUG's patented “Phase-Change” technology cools your hot beverage to optimal drinking temperature in minutes — and holds it there for hours. Cold drinks, well, they stay cold all throughout the day too. No electricity. No batteries. Just science. Design yours today.



Scientific Marvel

LEXO's revolutionary Phase-Change Advanced Heat Transfer technology makes the SMART MUG the most advanced tumbler on Earth.

Temperature Perfection

Hot or cold, SMART MUG will adjust to the optimal drinking temperature in minutes and hold it there for hours.

Tough Construction

Three layers of extra thick 18/8 stainless steel means the SMART MUG can handle whatever you throw at it. Plus, it's dishwasher safe.

Lids To Suit

Whether for daily use or prepping for a long campout, we've got a lid for you.

BPA Free

Our lids are made from BPA free food-grade plastic. Nothing weird in here.

Lifetime Guarantee

No worries. All LEXO products come with a lifetime guarantee.

This is not your standard tumbler


  1. Rated 5 out of 5

    My husband loves this for his coffee!

  2. Rated 4 out of 5

    I bought this as a gift for my wife, who loves to nurse her coffee for several hours. She claims this will bring the temp down to safe drinking levels, and keep it that way for some time. Her only complaints are the above average weight (this is not just a vacuum insulated tumbler, is has some hefty heat absorbing material in it), the opening on top is just a bit weird, and if your drink doesn’t start out super hot, it might cool the drink off just a little bit too much. On the plus side, regarding the weight, she insists it could be thrown for self defense if need be.

  3. Rated 5 out of 5

    These Lexo coffee mugs really are amazing. They cool super hot coffee from our keurig to drinkable temperature within 2-3 minutes. Then they hold that same drinkable temperature for an hour +.

  4. Rated 5 out of 5

    Keeps coffee hot all day.

  5. Rated 5 out of 5

    I like tea, but my whole life I’ve either burned my tongue or left it to cool and forgotten about it. I read about the Lexo in the newspaper and ordered it immediately through Amazon. I love it! I carry it around d all day and sip contentedly–it’s always the right temp and the tea always tastes great. There is never any metallic, thermos-y taste.

  6. Rated 5 out of 5

    Wife has been testing these guys for years, she says this might be “the one”! not too hot, not too cold.Handy for the car and at work. Should last too, well built.

  7. Rated 5 out of 5

    I have so long struggled with coffee or tea initially being too hot, and then cooling through the optimum range too quickly to comfortably drink it. This device uses a phase-change material to almost immediately drop the temperature to 140°F and then keeps it there for well past the time I take to drink it. It’s especially nice that I can make a cup of tea and start drinking it almost immediately after pouring it into this bottle.

    I rate this five stars because it’s so close to perfect for me and solves the problem brilliantly. It does have some downsides that may affect your decision, however.
    1. 10oz is a little small – I tended to drink 12-16oz of coffee or tea before I got this. My understanding is the company is working on a larger version, and I’ll probably buy it when it comes out.
    2. 140° is a little cooler than my girlfriend likes her coffee. It’s almost perfect, perhaps even a little hot, for me but she likes hers very hot. If you like yours hotter than most you may find this a little too cool.
    3. The stopper lid doesn’t pivot completely out of the way, so it presses on the bridge of your nose a bit when you’re drinking. Perhaps I just haven’t found the secret, but I wish it could be flipped all the way out of the way.
    4. It’s surprisingly heavy. That’s not a particular downside for me, but you should be aware of it.

    Despite these limitations, I would eagerly buy it again because it solves the problem so well.

  8. Rated 4 out of 5

    Wonderful temperature control! Quickly cools down too-hot coffee to drinking temperature, then keeps it there for many hours. Perfect for the office but I wouldn’t want to lug it around due to its weight.
    One star off for the following:
    1. It is heavier than you might expect due to its temperature control materials.
    2. The flip top makes it difficult to drink down to the last drop without tilting your head way back. (I took the flip top off. )

  9. Rated 5 out of 5

    Yeti and others miss the point, not keep the coffee hot, but keep it at drinking temperature. We can keep it too hot to drink, how does that help? This lowers the temp to drinking temp…stores that heat to go back into the coffee and keep it at drinking temp. No more waiting for it to hit the right temp and drinking it all down quickly! You can enjoy your coffee over time…what a concept!

  10. Rated 5 out of 5

    Great product, have given several as gifts!

  11. Rated 5 out of 5

    I recently received a Lexo Tumbler as a gift and I couldn’t be happier with it. In fact, everything the manufacturer promises is absolutely true. I have never had something keep a hot beverage at a drinkable temperature before and have to admit it is pretty amazing. No longer do I have to burn my mouth with hot coffee or let a cup cool down to the point I forget about it and then it’s cold. I am extremely satisfied with this product and highly recommend it. Remember, it’s not for keeping cold stuff cold – it’s for pouring the steaming hot coffee in and having it “cool” to the perfect drinking temperature in just a few seconds. Love this product!

  12. Rated 5 out of 5

    Amazing that this cup makes anything hot drinkable instantly! Love my new cup!

  13. Rated 5 out of 5

    This mug is awesome; I no longer burn my mouth and my tongue and it brings my hot coffee to a godd temperature very fast and then holds it there. I’ll be ordering for my family for Xmas. With my other cups, yes they do good at holding stuff hot, but then I burn my mouth. With those there is only a short period of time the temperature is not too hot, and not too cold. Lexo nailed it by getting the temp just right very fast and then keeping it there; About time !!

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