Shedding fiber is the occurrence of a rug or carpet shedding loose fibers. Shedding is very common with wool and other staple yarns. A rug or carpet will shed fibers for several months after a carpet is installed or a rug is placed in use. Minimal shedding should be expected for the life of the product.
ShawFloors.com writes: "Why do some carpets shed and others don't? The difference is that some carpets are made from staple or spun fibers, and others are made from continuous filament fibers."
BeaulieuFlooring.com explains: "Shedding is a normal characteristic of carpet manufactured from staple fibers.... Shedding occurs when individual spun/staple fibers work loose from tufts by the influence of traffic and vacuuming, and when sheared yarns that were not removed by manufacturing are removed later by vacuuming.... Shedding associated with a newly installed carpet made from spun/staple yarn often appears large in amount. This is because shed fibers captured by vacuuming are fluffed and agitated, and is also random in their orientation. As a result, newly installed carpets made of spun/staple yarn often initially release what can appear to be seemingly large amounts of fiber when vacuumed."
Read our definition of a staple yarn to better understand why shedding occurs.