Attach this backrest cushion to an office chair to achieve comfort while sitting for extended periods. Supports the entire back. The cushion is made with high-density polyurethane foam that retains its shape and helps promote neutral back posture while providing firm, responsive support. This ergonomic chair cushion includes an adjustable strap to help hold it in place on a variety of office chairs. The cushion's soft, brushed cover is removable for easy cleaning.