National Nail has expanded it's line of Stinger roofing products to include three synthetic underlayments: EXO25, EXO35, and EXO50. EXO synthetic underlayments are UV-resistant and can remain exposed for up to six months during construction. The synthetic woven fabrics offer high tear strength and proprietary, non-skid additives for better roof deck contact and high slip resistance. Each roll covers 10 squares, but weighs just 20 to 28 pounds depending on the product. This, in combination with pre-printed nailing patterns and overlap lines, helps increase roofers' productivity. Priced from $60 to $115 per roll.