12 Mil Thickness ~ 6 oz per square yard ~ Made of polyethylene ~ Hemmed edges and Reinforced Corners & Eyelets ~ 100% Water Proof ~ UV Protection ~ Heavy Duty Grommets Approximately every 18" on all 4 sides ~ All Temperature, all season use, Arctic Flexibility ~ All tarp sizes are listed as "Cut Sizes" This is the industry standard. The "FINISHED SIZE" is usually 3" to 6" smaller than the listed "Cut Size"