Please be sure to read the profile. I used this only when cold snaps came, as I lived in a very cold house, but I no longer need it, so I am selling it. I think I've used it less than 10 times, but it's a used item, so please refrain from purchasing if you are looking for perfection. It is currently on sale at Rakuten for 14,400 yen. It was introduced as being used by Haruka Ayase, and it warms up quickly like a foot bath because you put hot water in it. Your feet don't get wet like a foot bath, and it doesn't spill, so I think it's good for children who get cold easily (^o^). It came with a funnel that makes it easy to pour, so I will include it. The size is S, about 24 cm. The M size is 27 cm and quite large, so I chose the S size. Please take a look at the CLOZ website for more details. CLOZ Hot Water Bottle Cold Protection Hot Water Bottle Foot Bath