You don't need it for waterproofness, NEMO floors have that covered, but if you will be spending a lot of nights on gravel, this could add longevity to your tent.
Features :
• Floor Fabric : 70D PU Nylon (3000mm)
• Included Accessories : Drawstring Stuff Sack
Details :
• Floor Dimensions : 83 x 36 (footwidth) 27 in / 211 x 90 (footwidth) 69 cm
• Minimum weight : 5.3 oz / 150 g
