Made of 85% Linen and 15% Cotton. Yarn is overdyed for long, lasting stonewash color. Reverses to same. Zipper closure. Accommodates an 18" square insert. 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. By choosing our cotton products, you’re supporting our investment in Better Cotton’s mission. This product is sourced via mass balance and therefore may not contain Better Cotton. Learn more at bettercotton.org/massbalance. Imported. Machine wash in cold water on a gentle cycle. Use only non-chlorine bleach when needed. Tumble dry on low, warm iron as needed. Overall: 18" sq Zipper: 18" l