Nomad 4 Footprint Sierra Designs Footprints are made of 68D polyester taffeta (1800mm PU/WR/FR) and provide a perfectly sized protective tarp to utilize beneath Sierra Designs' tents to reduce wear and tear on the tent floor. Materials Fabric: 68D Polyester Taffeta, WR/PU1800mm, FR CPAI84 Tech Specs Weight: 13.8 oz / 390g Dimensions: 104" x 87" / 264.16 cm x 220.98 cm