The MEMBRANE sil line was developed with one goal in mind - create the lightest, most waterproof fabrics on the market. Same silpoly benefits of lower water absorption (i.e. no sagging) and increased UV resistance, but in a waterproof textile that's 15-30% lighter than traditional lightweight coated nylon/polyester fabrics. MEMBRANE Silpoly is the ultralight version of our MEMBRANE silpoly line of ultralight coated materials. At a finished weight of just 0.93 oz/yd2, it is the lightest waterproof polyester textile available. The material features the following: Custom woven, high-thread count 15D polyester Plain-weave construction High-quality sil/PU coating on each side MEMBRANE Silpoly is best for situations where you want the lightest possible waterproof fabric outside of Cuben Fiber. Lower water resistance than the PU4000 version, but ~15% lighter. A premium material for all projects requiring an extremely lightweight, waterproof textile. Common applications include tarps, tents, ponchos, gear sacks, pack covers, etc. *Note: this fabric is the exact same on each side. If seam sealing, we recommend using a 100% Silicone sealant such as Sil-Net. 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, Burnt Orange, Charcoal Gray, Crimson, Dark Olive, Foliage Green, Khaki, Lime Green, Moroccan Blue, Olive Yellow Width 58-59" usable, selvedge trimmed Weight 0.93 oz/yd2 finished weight Denier 15D Finish/Coating Sil/PU coated both sides (impregnated) Hydrostatic Head (i.e. waterproof rating) ~1500 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