48-in x 250-ft 1000-sq ft Synthetic Roof UnderlaymentIt's lighter, and stronger than felt it won't tear away from nails even in high wind Can be left exposed for up to 6 months It's slip resistant under wet conditions Lighter rolls make the one person application fast and easy with fewer trips up the ladder Suitable for use under all major roof coverings Features Series Name N A Coverage Area (Sq. Feet) 1000 Weight (lbs.) 28 Width (Inches) 48 Length (Feet) 250 Warranty 25 year limited Material Synthetic