These covers are used at the scene of a fire to protect property from water damage and foul weather. The floor runners protect the floors from unnecessary damage. Canvas Duck fabric is treated with a fire and water resistant finish. Meets CPAI Section 6. Water Resistant finish and mildew inhibitors added.Pre-finished size tarpauline may actually finish 3-5% less in size. Need to specify on the PO if a specific finished sizes is required.