This round cushion uses low-resilience material to distribute body pressure and a central hole to stabilize seating comfort. By slowly sinking towards the hole in the center, it stretches the back muscles. It has a reversible cover, with one side made of a Mylar-like fabric and the other side using cotton and linen. It feels cool and comfortable against the skin in summer and soft and fluffy in winter. The cover is removable and washable for cleanliness. ● Color: Blue Gray ● Size: Approximately 40cm in diameter x 9cm thick (measured for the low-resilience cushion only) ● Weight: Approximately 615g ● Materials: Core: Low-resilience urethane foam, Protective cover: Polyester, Outer cover (reversible): (One side) Cotton/Polyester, (One side) Cotton/Linen (Back: Urethane), Zipper: Nylon ● Notes: Machine washable (using a net) *Cover only ● Made in China This was used for only one month after childbirth. There are no stains, and it is in excellent condition. * No pets, no smokers.