what is slub

Slub is a term used in textiles production that refers to thickened areas of a fiber or yarn. Slubby fabric is woven from slubby yarn, which has a very variable diameter, resulting in an uneven texture. Both high and low slubbiness may be sought, and slubs in spun fibers may be produced deliberately by varying spinning tension. Slubs may be valued or deliberately produced for aesthetic effect, but they may also be regarded as a defect caused by either uneven spinning or using low-grade, lumpy or short-staple fiber. Slubby cotton fabric includes Madras, which is woven from short-staple cotton. Slub cotton is a common fabric for manufacturing t-shirts, sweatshirts, and activewear, and is usually knitted to form a stretch fabric. Slub knit is a type of fabric that is usually cotton or cotton blend, and is a stretchy knitted fabric with uneven fibers throughout creating an interesting textured or feathered look.