A great way to protect the pickup cab area from heat, sun and snow. Custom patterned for a perfect fit, cab area covers fit between the cab and pickup bed. Block-It 380 Series fabric is Kimberly-Clark's newest film barrier fabric, offering great performance at a competitive price. 3.2 ounces per square yard. The three-layer construction uses inner and outer layers of spunbond, sandwiching a middle layer protective film barrier. The film barrier has microscopic holes, smaller than droplets of water (and most dust particles), to stop moisture but still allow any moisture vapor or heat to easily escape from under the cover.