About the fabric: Sox Rough Grey consists of an unique mixture of polyester and lycra. It is extremely soft and feels like cotton against the skin. The fabric and fit is considerably more stretchy than any of our other models. Washing advice: Cold wash in 30 degrees C (86°F). Preferably in a separate little laundry bag to be sure that the tights don’t accidentally get caught in objects from other garments like for example zippers.