FREE PEOPLE Women’s RARE SOLD OUT Oversized In Too Deep Turtleneck Sweater Aqua Blue cotton blend sweater knit Size Small Pilling is not a fabric defect and may be present on pre-loved items. Pilling happens naturally when fiber in the material become loose and friction caused by movement on the fibers causes them to ball up. This is a normal, common and easily treatable. All fabrics will pill at least a little bit over their lifetime.