The HOBO Sauna Face Mask is a sheet mask that contains 83% Hokkaido's Noboribetsu Karlus hot spring water, developed for use in a sauna environment. Focusing on the increasing demand for saunas in recent years, it was born as a piece that can be used comfortably even in high temperature and low humidity environments that tend to dry out. At the time of its release in July 2023, it was the first non-woven sheet mask for saunas in Japan. The origin of development was the creator's own concerns. Because of my dry skin, my face hurt before it warmed up enough and I left the sauna room, and I couldn't take a cold bath, so I didn't know what it meant to feel. After using this product during repeated prototypes, the discomfort on my skin was relieved, and I was able to take a cold bath for the first time and feel the comfort of a sauna. This product is designed to turn sauna time into skin care time, delivering the moisture of Karlus hot spring water to the skin while improving the condition after the sauna. The glycerin-free and oil-free formula reduces stickiness while also considering ease of use. In addition, it is designed to be used in facilities and does not cause dirt or slippage even if liquid gets on the floor. This piece is recommended not only for sauna lovers but also for those who are concerned about dryness.