FelTex^® is a superior synthetic roof underlayment, recognized for exceptional strength, durability and performance. It balances strength and weight, provides dynamic steep-slope traction, and will not buckle, warp or crack. FelTex is rated for commercial and residential applications using plastic caps and roofing nails (3/8-inch head), and is an ideal underlayment for asphalt, shingles, metal, tile, slate, and a variety of sloped roofing materials. Whether you're working on a FelTex-protected roof, or living underneath one, you'll appreciate FelTex's quality.