A while back I mentioned I was working with a guy to create a multi-application woobie/doobie suitable for the NW Territory. Well it is done. You haven’t seen this before! The Underwoobie is a combination of military poncho, poncho liner, and shelter half, hunting/spotting blind, with the added functionality of use as a hammock underquilt and as a hammock top quilt or ground quilt. If you want to know what it can do, just search the Web for what a poncho or tarp can do, then add a hammock. Here’s the project info for you DIY guys: The Length & width of insulated area: 59" x 80". Overall (includes suspension channels): 63 1/2" x 84" Weight with suspension included: 3 pounds 3.5 ounces with 5 oz/yard Climashield Insulation and 1.9 oz/yd DWR inner shell. Due to seam allowances this number will vary somewhat from Underwoobie to Underwoobie and, because I'm doing this by hand in Texas and not on some assembly line in Wang Chow, none of these will ever be a perfect rectangle. Length and width variances do not affect functionality or the ability of one Underwoobie to snap to the other. Underwoobie Definition of terms: Outer Shell: this is the surface of the Underwoobie that will normally be presented to the weather when used as a quilt or shelter. Insulation: A synthetic material intended to trap body heat. Inner Shell: the opposite surface, normally where the body would come in contact with the Underwoobie when used as a quilt or shelter. Suspension channels: One on each side to be used to suspend the Underwoobie when used as an Underquilt. These also act as miniature draft/mudguards when used as a shelter, and storm flaps when used as a sleeping bag or topquilt/ground quilt. Suspension: a system composed of elastic shock cord, carabiners, and cord locks that allows for adjustment of the Underwoobie when used as an Underquilt. Materials: Outer Shell: is composed of Duro Epsilon in a MultiCam pattern licensed to Duro by Crye: Epsilon | MultiCam Fabric It is extremely strong and light weight. It resists tears and abrasions better than anything I've ever seen. When UPS tossed two five yard rolls over the gate here at the prairie bungalow, they spent the afternoon in the front yard with my dog (who has a side job customizing hiking shoes and slippers). The packaging was ripped to shreds and about a yard was pulled from the end of the roll. The only damage I found was a 3/4" long tear at the very end of the roll. I patched it with adhesive patching material and its on Underwoobie #1 right now. Finished Weight - 1.55 oz/yd² approximately Fiber Content - 100% nylon Construction - 164/118 (warp/fill) approximately Elemendorf Tear - 5/5 (warp/fill) lbs, minimum Air Permeability - 2 ft³/ft²/min It is a waterproof breathable fabric. Legally, I cannot advertise the water resistant finish on the Epsilon as I am not a licensee, but if you go to the link above you will see that Duro says it is treated with a Nanosphere finish. Information on Nanosphere is here: Schoeller Textiles AG - textiles and fabrics made in Switzerland: NanoSphere® I absolutely love this stuff. I won't make an Underwoobie with anything else as an outer shell. Insulation: Apex Climashield, a continuous filament synthetic insulation, in the weight/thickness of your choice. Climashield | Durable Warmth I can personally vouch that 5.0 oz/yd Apex will keep you warm and comfortable down to 40 degrees, and with proper base layers and clothing, down to 30. However, the Underwoobie is designed so that two quilts can be snapped together to boost that temperature rating. A man with two Underwoobies using 2.5 oz/yd Apex will have a top and bottom quilt that will keep him warm to the 50's, and when snapped together, and Underquilt that will perform better than one of 5.0 due to the additional layers of fabric. A man with a 5.0 Underwoobie and a 2.5 Underwoobie can get down to the 20's. Inner shell: Usually composed of a waterproof breathable fabric of the customer's choice. This is a generic fabric that is available from several suppliers, the quality from each of the same. The most common choice for underquilts is a Ripstop fabric that has been treated with a "durable water resistant" (DWR) finish. Most of these fabrics weigh 1.1-1.6 oz/yd before the finish is applied and the resulting weight is generally 1.9 oz/yd. Weight savings can be made by using an untreated fabric, but these types of Underwoobies, while serviceable as an Underquilt, should be used primarily as a top quilt and are not quite as durable as DWR. Underwoobies with DWR inner shells should be used primarily as underquilts or shelter tops and floors. While serviceable as a topquilt, the material is not as comfortable as unfinished Ripstop, and there may be condensation issues if used without proper ventilation. Underwoobies are designed to be ventable at the foot end, but care should be taken. There is another product available for use as an inner shell that is superior to DWR both in weight and performance that just came on the market: Argon CS-90 DIY Stuff :: ARGON CS90 Ripstop Fabric- Orange - Dutchware Gear | Makers of Dutch Clips and other Hammock Accessories Color selection is limited, and the price shown is an introductory price that is sure to go up. I have several yards in my possession now, and have used its predecessor, Argon, in the past. It is extremely soft and lightweight, almost translucent. It is half the weight of 1.9 DWR and 25% less than 1.1 unfinished Ripstop. The principal difference between the Argon I have used in the past and CS-90 is that the new fabric has a Ripstop grid for added strength and durability. Its principal drawback is that the fabric width is 58 "usable" inches, which means that an additional 2-4 " of fabric at the sides would be required to make a standard 60" wide Underwoobie that would work with other Underwoobies. It would be cost prohibitive to use CS-90 as the side fabric so another fabric of similar color, probably 1.9 DWR would be used and there would be a noticeable difference. If I could get it in 60 "usable" inches, I'd throw rocks at any other fabric out there and use only Argon CS-90 as an inner shell. It’s that good.