Hello dear customer, the interior of our product has a fluffy and soft raised structure. This feature enhances the comfort and warmth of the product while not restricting your freedom of movement. The furry structure on the inside of the product offers an extra comfort during use. However, it is expected to not pill when washed in accordance with the usage and care instructions. We recommend that you follow the washing instructions on the inner label of the product. If you have any other question, we will be glad to help.