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, Patio52