How to use HotSmart mugs
Step1 Simply preheat them for one minute in a full size microwave oven (1200W) step2 There is no step 2 ; just serve your coffee HOT as usual, it will stay HOT to the last sip. Below: This is why or rather how it works HotSmart Mugs are a patented "microwaveable heat storing device" Enjoy coffee IMPORTANT NOTE: The lady who wrote the negative feedback on Amazon.com DID NOT preheat her mug. (Can I blame her? Well... I need to teach people what they are buying when they purchase either a HotSmart Plate or a HotSmart Mug IMPORTANT: HotSmart Mugs were designed to keep HOT coffee hot for full enjoyment , that's all; and they work as claimed or your money back. A-Z GUARANTEE .