The Atlas Summit S60 Synthetic Felt offers large surface area placement with each roll covering 10 square (1000 square feet). The high UV exposure allows for the underlayment to be laid, walked on, exposed to rain without any damage to your home. The slip resistant coating prevents falls when applied while the roof is being added. Unique Top Surface Fabric Allows for Enhanced Walkability. Meets ASTM D6757, Inorganic Shingle Underlayment. Standard Performance Characteristics. Exceed ASTM D4869 & D226. Florida Building Code Approved - FL 16226. UL Classified.