This is my second set… you need 4 panels for patio sliding door. Love the material feel and pattern. Adds some discreet muted color and movement to the area without being loud due to the colors that blend seamlessly together. It appears that cat hair does not stick as my kitties have been weaving in and out of panels and I see no hair on them. Perfect length. Block out the hot summer sun and makes house feel color. Highly recommend.