Front fabric is made of 100% linen; reverse fabric is 52% linen and 48% cotton blend. Reverses to solid natural. Zipper closure. To learn more about our environmental commitment click here. STANDARD 100 by OEKO-TEX® Certified: tested for 350+ harmful substances to keep you and your family safe from chemicals common to textile manufacturing. Accommodates a 20" square insert (sold separately). Imported. Machine wash cold; gentle cycle. Use only non-chlorine bleach when needed. Tumble dry low. Warm iron if needed. Overall: 20" sq Zipper: 19" l