From the Joann site:
Used For: Best for apparel patterns calling for fabrics that have stretch, such as leggings, casual dresses and tops and some types of skirts.
Special Benefits: Provide high stretch, elasticity, comfort, soft drape, and typically does not require ironing.
Width: 57 Inches
Content: 60% Cotton 40% Polyester
Care: Machine wash gentle separately cold, mild detergent, non-chlorine bleach, reshape, lay flat, cool iron