The flattening of pile fibers under sustained weight, as in a high-traffic path or beneath heavy furniture, which leaves the pile looking worn. In storage the same happens when heavy items are stacked on a rug for long periods. A rug pad and padded coasters under furniture legs spread the load, and rotating the rug about once a year shifts where the weight falls; a medium to high pile and a dense weave withstand heavy beds and dining tables best, and regular vacuuming and professional cleaning keep the pile in shape.