SilverCrate+™ Wheelchair Seat CushionINTRODUCING The SilverCrate+ Wheelchair Seat Cushion Safety First: To improve the safety of users in the wheelchair for daily activities, we designed a non slip bottom and added a detachable strap to help fasten the wheelchair cushion in the wheelchair or other chairs. (Cushion size: 18"x16"x3") Superior Memory Foam: As prolonged sitting increases tailbone pressure, this chair cushion uses superior memory foam, which better responds to your body heat,