Tested for hot coffee and it works GREAT! Stanley writes this about this great java holder: “Meet your new best friend. Once you use this workhorse of a mug, you’ll never want to use anything else. 
This one handed vacuum insulated mug brings the thermal performance of a vacuum insulated thermos into a portable mug. One handed and fully leak-proof, you can drink your morning pick-me-up on the go one handed and with no spills. Featuring a lid that comes apart for proper cleaning, you can enjoy clean drinking day in and day out.”
They made this mug perfect. After about 60 plus uses over no leaks and can’t see one down the line. the mug top seals very tight to it’s bottom. The mug top works with a simple button, opposite the side of it’s drink spout. Again zero issue with it’s operation. Finally, does it keep liquid warm/hot for seven hours? We test the mug on three different days, each of these days the air temperature was between 50 and 60 degrees and after a long day fishing each day, 16 ounces of hot coffee was waiting. Truly a great find from Stanley, and a perfect choice for an outdoorsman or a 9-5er looking to keep his java hot on his commute.
Order Link – http://stanley-pmi.com/store/stanley/en_US/pd/ThemeID.39334800/productID.325297900
Features:
- Vacuum insulation body + thermal lid keep drinks hot or cold 7 hours or iced 30 hours
- 18/8 stainless steel won’t rust; naturally BPA-free
- Push button lid lets you open, drink, close with one hand
- Leak proof and fully packable
- Dishwasher safe lid disassembles for deep cleaning