Front is woven of a blend of 50% Viscose, 30% Cotton, 12% Polyester and 8% Linen. Reverses to 52% Linen and 48% Cotton. Zipper closure. STANDARD 100 by OEKO-TEX® Certified: WSI Certificate #: 14.HUS.42449: tested for 350+ harmful substances to keep you and your family safe from chemicals common to textile manufacturing. Accommodates a 22" square insert. Imported. Machine wash in warm water; gentle cycle. Use only non-chlorine bleach, if needed. Tumble dry on low heat; remove promptly. Warm iron as needed. Overall: 22" sq Zipper: 21" l