SIZE 19" x 17.5" x 4" Large Super Thick Gel Memory Foam Seat Cushion: Pressure is spread over a larger area, giving you a more comfortable fit. Hard and even traditionally padded seating surfaces create pressure on your tailbone causing Pain, Poor posture, Improper spine alignment, Decreased blood circulation, Pinched nerves Orthopedic problems. OUR CUSHIONS CAN HELP! PAIN RELIEF for Back, Legs, Hips, and Sciatica: Designed to provide comfort by alleviating pressure on the lower back, waist, hips, and thighs. Our office chair cushion also helps relieve sciatica symptoms, allowing you to power through your day. Its curve design minimizes the pressure that other chair pillows can cause to improve blood circulation.4 INCH memory foam provid adequate support and comfort,suitable for people who is overweight and need seat booster. NON SKID BOTTOM AND CARRY HANDLE - make it portable and easy to transport . Great for: Office Chair, Computer Desk, Kitchen, Dining room, Living room, Patio, Couch, Recliner. Take it with you to Sporting Events to use on Benches and Bleachers. Great for Car, Truck, Train Airplane Travel, Classrooms. Place it on the floor for Yoga, Meditation or as a Kneeling Pad Cushion for Tasks. Breathable mesh cloth cover and gel cushion layer: The zippered removable, black MESH COVER is MACHINE WASHABLE for easy cleaning.The combination of cover and gel cushion provides SUPERIOR AIR CIRCULATION AND BREATHABILITY to KEEP YOU BUTT COOL while you sit. Durable, stands up to tough everyday use. POLYMER MEMORY FOAM inner core: Different from other cushion which made up of two type of sponge, the 4INCH thick full memory foam core used in YOUFI cushions provides better comfort and support without flattening.If you are troubled by hemorrhoids,overweight or sciatica, choose this extra-thick cushion,the best cushion for long sitting.