High density, rip resistant polyethylene material. UV resistant, 4.5 mil. Thick. 8 x 8 weave count per square inch, 1000 denier. Lightweight, approximately 2.8 oz per square yard. Heat sealed seams, rope lined. Aluminum rustproof grommets approximately 2 feet apart and each in corner.UPC Coded. Weatherproof: UVI (Ultra Violet inhibitor) Treated for sun resistance. Weatherproof mildew, resistant and rot proof.