MEMBRANE silpoly PU4000

Ripstop by the Roll

$5.50 /yd 
Olive Yellow
Charcoal Gray
Dark Olive
Blaze Yellow
Deep Purple
Robin Egg Blue
Royal Blue
Olive Drab
How to send
Which should I pick and why?
No order minimum. Choose this option to send fabric cut and folded (like a blanket).

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 and increased UV resistance, but in a waterproof textile that's 15-30% lighter than traditional lightweight coated nylon/polyester fabrics.

MEMBRANE Silpoly PU4000 is the high water resistance version of our MEMBRANE silpoly line of ultralight coated materials. To achieve high water resistance with low-stretch, the material features the following:

  • 15D polyester plain-weave construction
  • High-quality sil/PU coating on one side and multi-pass PU4000 coating on the other

MEMBRANE Silpoly PU4000 is best for situations where you want to save weight, but still have the highest water resistance possible. The PU4000 coating also allows seams to be taped and reduces bias stretch making the material somewhat easier to sew. 

A premium material for all projects requiring an extremely lightweight, waterproof textile. Common applications include tarps* (see note below), ponchos, gear sacks, pack covers, etc.

*Note - If using for a tarp, please keep in mind that this material pushes the limit on weight, waterproofness, and durability. We do not recommend use outside of relatively low-stress applications. 

*This fabric has distinct shiny (PU4000) and matte (sil/PU) sides. It is recommended to put the matte side facing out and shiny side facing inwards. If seam sealing, we recommend using a PU sealant such as Seam-Grip on the PU4000 side of the fabric. 

Want to quickly compare all our lightweight coated/non-breathable fabrics? Check out the "Fabric Comparison Guides" on our FAQ page. 


Product Details
Colors Olive Yellow (N/A), Black (N/A), Charcoal Gray (18-0601), Dark Olive (19-0516), Khaki (16-0726), Black (N/A), Olive Drab (18-0622), Blaze Yellow (12-0643), Crimson (19-1762), Royal Blue (19-4245), Deep Purple (N/A), Robin Egg Blue (3248)
Panton ref # N/A
Width 58-59" usable, selvedge trimmed 
Weight  1.07 oz/yd2 finished weight 
Denier 15D
Finish/Coating Sil/PU one side, multi-pass PU4000 other side

Ordering/shipping info

Order Change/Combination Policy

To maintain fast and efficient fulfillment, please note that no order changes/combinations are permitted after order placement (except address changes). Please see FAQ page for full details. 

Continuous Cut Policy

Please see below for our continuous cut policy. Note this policy applies to each separate product on the order:

Fabrics - < 20 yds guaranteed continuous

OutdoorINK® prints - < 10 yds guaranteed continuous

Insulation - < 5 yds guaranteed continuous

Zipper - < 25 ft guaranteed continuous

We always attempt to give a continuous-cut if possible, but splices are present in various materials due to the manufacturing process. Unless otherwise notified, all orders will be cut per the above policy.

IMPORTANT: If you are ordering larger amounts and have specific cut requirements, we can make cuts that work for you, but you MUST list these reqts in the notes section of the order. These notes can be added on the cart page. 

Also please note that as a general policy, we DO NOT offer custom cuts (e.g. 40 yd order cut into 4x10 yd lengths).

Please see our FAQ page for full details.

Shipping Availability USA and International 
Shipping Method/Rates

USPS Priority Mail or First-Class - Tracked and Insured. Select larger orders shipped via USPS Parcel Select or UPS ground.

Domestic (USA) flat-rate shipping
Fabric/components - $6.95
Orders containing insulation/3D mesh - $11.50*
*select destinations add $5 - CA, MT, CO, NM, AZ, UT, NV, OR, WA, CA, ID, WY, AK, HI

*Note: certain bulk orders may be subject to additional shipping charges. Please see our FAQ page for further details.

International shipping
Fabric/components - Cost based on weight/size. See shipping calculator on cart page once ready to order.
Orders containing insulation/3D mesh - Due to bulk, exact shipping costs will be billed separately AFTER your order is submitted. Once your order is packed and ready, you will be sent an electronic invoice to pay for shipping costs via credit card or Paypal. Note that your order will be held until payment is received for shipping.

Please keep in mind that international shipping for insulation/3D mesh can be costly given the size of the items. Be aware that once we cut your order, any cancellation would be subject to our standard 15% restocking fee. Thanks in advance for your understanding.

International shipping of insulation/3D mesh is currently a trial program and limited to Canada and Australia ONLY. We have no timeline for adding additional countries. As an alternative for our customers in other countries, please consider the forwarding service Shipitto.

Estimated Delivery Date In-stock orders typically ship within 24 hours. OutdoorINK® print on-demand fabrics typically ship within 3-5 days of order placement. For the most up to date shipping times, please check our update page HERE.


ripstop samplesSAMPLES - Trouble deciding or want to see the fabric first hand? Head over to our samples page to order a custom sample pack.

MEMBRANE silpoly PU4000 has a rating of 4.8 stars based on 24 reviews.