In addition to its durable dual gel bladder that eliminates any gel migration, the cushion's unique cut-out design removes pressure from the coccyx bone and promotes healthy posture. Designed with high density and resilient foam, the coccyx cushion contains state-of-the-art gel technology that provides extreme comfort and transforms your chair into a premium seat. The ProHeal gel coccyx cushion is a premium quality cushion that relieves and prevents pressure sores and tailbone pain..