In humid Japanese climates, moisture protection is required throughout the year.In spring - summer and rainy season, moisture caused by sweat, fall - winter, etc.
We are sweaty while you sleep.In winter, about 6.8 fl oz (200 ml) (1 cup) in summer tropical nights, more than 16.9 fl oz (500 ml).(When it comes to summer, it is enough for approximately 1 bottle of plastic bottle. It does not mean that sweat flows through the pores as water droplets, but it is also used as steam from the pores.Even if the comforter looks like it is not wet, it still gets sweaty.