In addition to improper wear or friction with hard objects, some loose fibers will be dislodged or entangled after a few times of wear, which is completely normal. Even the best quality cashmere sweater will have a slight pilling phenomenon in the moderate range when it is first worn.
1. Due to the special characteristics of the fiber itself, the reasons for the pilling of cashmere products include the following factors:
(1) the length of the fiber: longer fibers woven into the fabric of the degree of balling is lighter than the shorter fibers woven into the fabric; due to the length of the unit of the fiber head section number of fewer, exposed to the yarn and the fabric surface of the fiber ends are also fewer. Cashmere fiber length in 35 ~ 45 mm, and wool fiber length in 70 ~ 140 mm.
(2) the fineness of the fiber: coarse fibers than fine fibers are less prone to pilling. Coarse fibers spun yarn, the number of fibers per unit area, less, exposed yarn and fabric surface of the fiber end less; in addition, the thicker the fiber, the more rigid, erected on the surface of the fabric is not easy to entangle the fibers into a ball. Cashmere fineness is significantly smaller than wool.  (3) the degree of curling of the fibers: more curling of the fibers, the inter-fiber holding force, friction increases, the fibers are not easy to free to the surface of the fabric, it is not easy to balling. Cashmere curls less than wool.