What Causes Sheets to Pill?
Pilling on sheets can be caused by several factors. Most likely it is the type of material that is the problem, but can also be due to a low thread count or poor laundry detergent. Buying sheets that are a cotton blend (like sateen), using fabric softener, and having a 300 or higher thread count (the higher the number the softer the sheet) will help sheets keep their softness and quality.