A sake warmer with a double walled vacuum construction that allows you to enjoy authentic hot sake in the comfort of your own home. Simply pour hot water along the guide lines on the inside to create your desired temperature, from lukewarm to extremely hot (after about 10 minutes). This stainless steel sake warmer has a double vacuum structure, so it has excellent heat retention and can keep lukewarm sake warm for up to approximately 70 minutes. *The duration for which heat is retained varies depending on the usage environment. The sake is slowly heated without losing heat from the water, resulting in authentic hot sake with the flavor only possible with the hot water bath method. It comes with a ceramic sake bottle designed specifically for sake warmers that holds approximately 2 go (approximately 330 mL).