Reduces strain on the lower back and buttocks. This cushion is ideal for use as a wheelchair cushion. The cover is made of super water-repellent, antibacterial fabric. Materials: ○ Core: 100% molded low-resilience urethane foam (neuron foam) ○ Cover surface: 100% polyester, antibacterial treatment, super water-repellent treatment ○ Cover backing: Acrylic resin rubber, non-slip treatment ＜Specifications/Size＞ ○ Size: Width 40cm x Length 40cm x Thickness 5cm ○ Made in Japan There are some stains, but there are no odors. It can still be used. Thank you for your understanding.