PREMIUM MEMORY FOAMOur office chair seat cushion is made of 100% pure memory foam, soft and firm, utilizing your own body heat to adapt to your curves, the ergonomic "U" shaped cut-out design delivers superior comfort, effectively supports the tailbone and relieves pressure on the buttocks caused by sitting for long periods of time. ConvenientNon-slip rubber bottom keeps the buttock pillow in place even when moving in the seat. Machine washable zippered breathable cover is easy to clean, just remove the cover and throw it in the washing machine. Built-in handles for easy transportation. Multiple UsesThe chair cushion supports the recovery of spinal problems, such as lower back problems, herniated discs, tailbone injuries, sciatica, and more. Large size (18.11''x14.17''x3.15'') fits all types of chairs, great for office, home desk chairs, car seats, gaming chairs, mobility scooters, car seats, wheelchairs. Also suitable for traveling, sporting events or wearing while pregnant. Material SafetyAll parts of the seat cushion are certified to be safe and harmless to human health, without any additives. The premium memory foam of this seat cushion quickly bounces back and returns to its original shape after each use and can be used to increase the height of any seat. Excellent GiftExcellent birthday or Christmas gift for family, friends and pregnant women. Relieve sciatica, arthritis, lower back, hip, spine, post-surgical injury or pregnancy pain relief. Ocho.