Introducing Insulated Concrete Curing Blankets. These orange concrete covers are coated woven poly tarps with a closed-cell PE foam core. They have a 8x8 weave with 3/16" thick foam that has been double stitched and has reinforced hems for added strength and durability. The concrete curing blankets have an R-rating of 2.2 and feature resistance to tears, mildew, UV and water. Size Disclaimer: All the sizes are industry standard "Cut Size". "Finished Size" is approximately 3" shorter on each side.