15' X 20' Firestone Rubberguard&trade; 60 Mil Epdm Roofing Rubber The Most Popular Material for New And Reroof Low Slope Roofing Applications Outstanding Durability And Low Life Cycle Cost Means Excellent Value Perfect for Do-It-Yourself Homeowners or Roofing Contractors Flexible Material Allows Design Versitility and Easy Installation Easily Contours to Unusual Roof Shapes: IF USING FOR A DECK OR ROOF, MAKE SURE YOU ORDER EXTRA LINER THAN AN EXACT SIZE SO YOU CAN WRAP AROUND THE DECK. GETTING AN EXACT SIZE WILL NOT BE SUFFICIENT TO COVER THE DECK OR ROOF CORRECTLY.