Front is made of 60% cotton and 40% linen. Back is made of 52% linen and 48% cotton. Reverses to solid. STANDARD 100 by OEKO-TEX® Certified: WSI Certificate #: 14.HUS.42449 HOHENSTEIN HTTI: tested for 400+ harmful substances to keep you and your family safe from chemicals common to textile manufacturing. Zipper closure. Accommodates a 22" square insert. Imported. Turn inside out when machine wash in cold; gentle cycle. Use only non-chlorine bleach when needed. Tumble dry low. Warm iron if needed. Overall: 22" sq Zipper: 21" l