Tarpsupply 40'x40' Heavy Duty White Poly Tarp Finished Size is 38-Feet 6-Inch by 39-Feet 4-Inch UV treated on both sides for superior sunlight protection. Water and Wind Resistant, Rot and Mildew Resistant Double reinforced corners for added strength. Arctic Flexibility 12 x12 Weave; 5 oz/sq yard; 1200 Denier Thick.