IKEHIKO Japanese Traditional Igusa (Rush grass) Tatami Mattress, Twin XL. Made in Japan Uses 100% Rush Grass. (Grown in Japan) Size: 39 x 83 x 0.5 in. Can folded in three. (Folding size: 39 x 27.5 x 1.5 in.) Use as a Oriental Rug on the floor, Use as a Underlay Mattress for the Japanese Traditional Futons too. Provides Maximum Comfort. Rush grass have a peculiar smell. There are also people feeling smell strongly because there are individual differences. If you are worried about smell, please do a shade for a day in a well-ventilated place. I think whether it will not bother you to some extent although it does not completely disappear. Made by Japanese Craftsmen.