The office chair cushion has an ergonomic U-shaped design that reduces pressure on the sciatic nerve and tailbone and thus relieves pain Features: ?Hemorrhoid Seat Cushion?This orthopedic seat cushions for hemorrhoids with a scientific central hole allows the hemorrhoid area to be suspended and breathable, relieves hemorrhoid pain, helps improve hemorrhoid problems and protects the buttocks from heat and moisture ?Ergonomic Seat Cushion?The office chair cushion has an ergonomic U-shaped design that reduces pressure on the sciatic nerve and tailbone and thus relieves pain. The contoured shape conforms to your pelvis to improve your posture and support your thighs and hips, allowing you to sit more comfortably ?Larger and More Comfortable?Our chair cushions measure 19 x 17 inches (backrest height 6 inches), which is larger than other cushions and makes sitting more comfortable. You can use it as a car seat cushion, office chair cushion, wheelchair cushion and gaming chair cushion ?Easy Care and Non-slip?The seat cushions for office chairs have a smooth, skin-friendly soft cover, which is removable for daily cleaning and machine washable. The bottom of the seat cushion is equipped with an anti-slip design to ensure seat stability and safety ?High-quality Memory Foam Seat Cushion?The tailbone pain relief cushion is made of high-quality, dense memory foam with sufficient compression and padding to provide maximum comfort. Recovers slowly after each use and returns to its original shape so you don't have to worry about flattening Note: the materials black and grey are different. Black is mesh fabric and grey is smooth and skin-friendly fabric Package Includes: 1 x OfficeChair Cushion Listing and template services provided by inkFrog