Our seat pads no additives, soft but firm, could relief butt pressure effectively from long sitting. This seat pads has a machine washable zipper for easy cleaning. This seat pads U-shaped design ergonomic seat cushion for office chair provides the best comfort while reducing pressure on the coccyx, tailbone and promoting well-shaped posture. This seat pads is suitable for various seats on most occasions, office chair, desk chair at home. It will be a great travel companion with you, Just always sit comfortably wherever you go.