New/Unused R 2.5 Concrete Curing Blanket Skin Material: Woven Reinforced PolyethylenePoly Material Thickness: 6 MilsInsulation: Cell Foam, Bubble, and Reflective LayersR-Value: R2.5Sizes: 12′ X 25′ (finished sizes are slightly smaller than shown size)Quantity: EachColor: Black-Top Side / Silver-Bottom SideThese Concrete Curing Blankets have high quality 6 mil Poly skins that create an R-Value of 2.5. This durable skin is a woven with reinforced poly that has a Black top surface and silver bottom. The blankets have a closed cell foam, bubble and a reflective layer that provides insulation between the poly skins. Grommets are inserted with spacing approximately every 8″ along the 12′ sides and in the four corners.