Why are my inserts lumpy and does this affect their efficiency?

AppleCheeks Viscose from Bamboo One-size inserts are made of 70% viscose from bamboo/30% organic cotton viscose from bamboo fleece. Due to the milling process, these fabrics might create lint during washing. Sometimes this lint will compact into balls in between the layers of the insert. This is an esthetic issue only and does not affect either the absorbancy of the product, nor your baby’s comfort.