Review on ☕️ COSORI Coffee Mug Set of 2 with Heat-Resistant Handle & Slip-Resistant Sleeve - 17 oz Stainless Steel Cups, Perfect for Coffee, Tea, Water, Cocoa, Milk - Best Match with Mug Warmer - C1601-CM, Black & Blue by Michelle Ocampo

I bought these mugs to use on a table warmer because my coffee usually gets cold before I'm done. I've used ceramic mugs with heaters, so I figured these stainless steel mugs would hold the heat better. The end result was that the coffee cools faster and the metal can get too hot to drink the first time you pour the cup. I think it's because metal transfers heat faster than ceramic, so heat is lost faster and the heater can't handle that loss. If I had a more powerful heater maybe they would stay warm longer. I use an 18 watt heater. I stopped using them because the whole purpose of buying them was to keep my coffee hotter for longer.