Breathable Cushion: Orthopedic seat cushion for back pain relief comes with a breathable 4D mesh fabric cover. Hip Pain Relief Cushion is made of premium memory foam with high density and excellent elasticity. Ergonomic Cushions for: Scientifically designed, this ergonomic office chair cushion set can provide you with a firm support and help relieve pain and pressure from your neck, back, sciatica, tailbone and legs and correct your sitting posture. Non-slip bottom and machine washable cover:The non-slip rubber bottom of the cushion which can be used on any surface, it is not easy to slip (on a flat surface). Simply remove and wash the cover in the washing machine. Universal: Whether in the car, on an office chair, dining chair or wheelchair, our ergonomic cushion is an essential accessory for your comfort.Packaging: This package contains one pillow in a plastic bag, but due to vacuum packaging it may appear as one large pillow. Each cushion measures 48 x 41 cm (18 x 16 inches) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.