Regular polyester yarn is smooth, uniform, and consistent in thickness along its entire length. This results in fabrics that have a clean, even look and feel, with little variation in surface texture. These fabrics are typically sleek and provide a more polished finish.

On the other hand, polyester line-like slub yarn is intentionally irregular, with alternating sections of thicker and thinner yarn, creating a unique texture. This variation results in fabrics with a more natural, rustic feel, similar to that of linen or other natural fibers. The thicker sections of the yarn introduce a tactile and visual texture that stands out, adding depth and character to the fabric. When touched, slub yarn fabrics can feel rougher, with a more organic and less uniform sensation compared to the smoother feel of regular polyester fabrics.

In summary, while regular polyester yarn offers a uniform, polished finish, polyester line-like slub yarn introduces a textured, rustic quality that enhances the fabric's appearance and tactile experience. This difference in texture is a key feature of slub yarn, contributing to its distinctive, natural look.