Koshi Raku Cushion - Brand: True Sleeper - Model Name: Koshi Raku Cushion - Size: 420 x 380mm - Material: 100% Polyester Thank you for viewing. I tried it after taking it out of the outer compression pack, but it didn't fit the size of my chair, so I've been storing it. A dedicated cover was not included from the beginning. (It seems that the older types came with a dedicated mesh cover, but this one had a mesh cover sewn on from the start.) I purchased it from the official online shop in 2024. I bought it as a set with a True Sleeper low-rebound mattress, and I'm using the low-rebound mattress with love. This cushion is also an item that you can use comfortably if you use it on chairs and sofas with a firm backrest. Please refrain from purchasing if you are nervous about home storage. It will be shipped compressed. If possible, I plan to use Eco-Mercari delivery (designated delivery). If you are resistant to designated delivery, please refrain from purchasing. Thank you very much.