GAF Tigerpaw 48 in x 100 ft 400 sq ft Polypropylene Roof Underlayment Torx Sockets 92 Leg Diameter (in 92 Leg Diameter (in hex shank adapter included for use with cordless impact tools Feet) 400 Weight (lbs may also be used with non asphaltic systems such as slate wood metal Excellent walkability: special surface helps provide excellent walkability versus conventional felts or typical synthetic underlayments Stronger: non woven construction provides greater tear strength than standard #30 felt Lightweight: at approximately 16 lbs it's easier to load and handle on the roof than conventional felts Cooler to work with: light grey surface is cooler in hot weather than black felts UV resistant: resists UV degradation for up to 180 days