The My 123's 4 piece airflow bumper is 10.25 inches high x 158 inches long. The short sides are 10.25 inches x 27 inches with ties in each corner. The long sides are 10.25 inches x 52 inches, with 3 ties along the top and bottom. The bumper is made of 100% cotton, 100% polyester and 85% polyester and 15% nylon fabrics. Fiber filling is 100% polyester. The patent pending airflow bumper is designed to help prevent suffocation and rebreathing carbon dioxide. It keeps arms and legs from getting stuck in the crib slats. The fabric collapses to impede climbing. Care instructions: machine wash cold with like colors in gentle cycle, do NOT bleach, tumble dry low.