Nylon is sometimes blended with cotton for reinforcement and durability. Sometimes spandex yarns are added for stretch and comfort. A new, cellulosic-based fiber, Tencel, is being introduced in denim blends with polyester. The presence of cotton contributes absorbency and comfort. The fabric also tends to soften with wear and laundering, giving the feel of well-worn blue jeans.
Polyester contributes durability, stability or shrink resistance, and wrinkle resistance.
Ease of care in laundering, as well as shorter drying times result from the presence of polyester fiber. Tencel fiber performs similarly to cotton in absorbency and comfort. It dyes easily. Fabric Traditional blue jeans fabric is a tightly woven twill construction. The yarns have a very hard twist for durability, but this construction feature affects color also.