This is the waterproof version of our custom developed HyperD® line of lightweight diamond grid ripstop nylon. This fabric is coated with a silicone/PU layer on one side, then a multi-pass PU coating on the other to create a highly waterproof/non-breathable fabric. At a 1.6 oz base weight, HyperD® PU4000 offers increased durability, lower stretch, and much higher waterproofness than our 1.1 oz Silnylon. Great for projects such as tent/shelter floors, ground sheets, tarps, ponchos, gear sacks, pack covers, or any application where midweight, highly waterproof/windproof fabric is needed. *Note - shiny side is PU4000 and dull is sil/PU. If seam sealing this fabric, you will need a sealant intended for PU coated materials (e.g. Seam Grip). Want to quickly compare all our lightweight coated/non-breathable fabrics? Check out the "Fabric Comparison Guides" on our FAQ page. Details/Specs Product Details Colors Black (N/A), Charcoal Gray (18-0601), Dark Olive (19-0516) Width ~58'' usable, selvedge trimmed Weight 1.6 oz/yd2 (*~1.9 oz/yd2 with sil/PU + PU4000 coating) Denier 40D x 40D Finish/Coating Sil/PU mix one side, multi-pass PU4000 other side Hydrostatic Head (i.e. waterproof rating) ~4000 mm Ordering/shipping info Ordering/Shipping order-change-title order-change-desc cont-cut-policy-title cont-cut-policy-desc Shipping Availability USA and International Shipping Method/Rates shipping-summary Estimated Delivery Date estimated-delivery Samples sample-redirect