This is a seat cushion from Magniflex, known for its high-end mattresses. I was looking for a thick, high-resilience cushion and tried it out at the Magniflex showroom in Omotesando. I was so impressed by its overwhelming resilience that I bought it. I'm selling it because it doesn't fit the unique shape of the chair I use for working from home. It should fit most standard chairs and business chairs without any issues. I only sat on it once to try it out, so it's considered unused. I will ship it in the cardboard box it came in. W40 × D40 × H8 Price: 6,930 yen The following is a reprint from the Magniflex official website: The Magniflex seat cushion can be used in various ways, such as on a chair, on the floor, or on a tatami mat. It uses Magniflex's unique material, <Eliocel®>, for the core, which provides excellent pressure distribution. One side is curved to support the back of the knees. It is recommended for long hours of sitting. Removable and washable cover The cover can be removed with a zipper. You can wash it at home in a laundry net. Uses 'Eliocel®' 'Eliocel®', an eco-friendly material foamed with water, is excellent in functionality, such as high resilience and durability, and is ideal for long-term use.