When rayon is added to a cotton-polyester blend shirt, the result is what’s known as a triblend. The addition of rayon makes the fabric of these tees uniquely softer, with an almost vintage and worn-in feel. Triblend tees have the softness and breathability of cotton, the durability of polyester, as well as the additional softness and shininess of rayon. For these reasons, triblend tees are quickly gaining popularity and becoming a favorite among many consumers.