From early spring, it became a hot summer day and I was having trouble sleeping, so I looked online for something to help, and I saw that Nitori's N Cool Super was good, so I ordered it. I was also considering a similar product from another manufacturer, but this one has a good weight to it, and you can use the pile side in spring and autumn, and the cool side on hot days. I also bought a pillowcase, so I don't have to turn on the air conditioning when I go to sleep, which is good for my throat, and I don't wake up in the night because it's too hot. I also bought a pillowcase from Deco Home, so it's just as cute as it looks. It's great to use both sides.