I am Korean and my parents wanted a Jangsoo stone bed, so I bought it for them. The Jangsoo stone bed sold here has applied "Ondol," a traditional floor heating system in Korea, to the bed. In fact, I think it is an amazing idea product. It is said that the stones in the bed warm by electricity and maintain proper temperature for sleep, so parents can sleep warm and deep. It is said that it increases immunity by raising body temperature while sleeping, so I think it was a good gift for my parents. When I visited the store to buy a stone bed with my parents, there were so many different products, and I didn't know what to choose, but the owner of the store was kind and detailed, which helped me a lot. If your parents have insomnia and weakened health, I recommend a Jangsoo stone bed. I was understanding what an ondol is, but if you don't know what it is, just stop by the store. You can experience that there are special beds and heating methods in the world. read more