Yarn Sizing is the process of applying adhesive coating on the surface of yarn for better weaveability. This process is done after the completion of warping process. It is one the most important process to achieve optimum weaving proficiency for each and every type of yarn. The objective of sizing, however, sizing cannot be looked upon as a process that improves the basic quality of yarn.  A properly sized yarn should have adequate improvement in abrasion resistance, indirectly indicated by the increase in tensile strength, minimum loss of extensibility and required amount of moisture.

Due to application of sizing materials upon the yarn surface, following characteristics of yarn have changed-