The SING UL , this is strictly a bivvy with the same dimensions of the Trifecta except the zipper is only half the length. This bivvy is the lightest and the most water resistant in my bivvy line up. Made out of Tyvek 1460C or "spunbonded Olefin" ultra-soft material that blocks 98% of the sun's ultraviolet rays, is tear resistant, water resistant, and breathable. Its high durability to weight ratio makes it the perfect material for the Trifecta. I kept the dimensions identical to the standard Trifecta measuring "35.4 inches (90cm)" by "87.7 inches (223cm)" Keeping with the popularity of the Trifecta It has the SING UL has the same ipx5 water resistant zipper with two double pulls. Upgraded specialized thread to help with water proofing, reduced the zipper to half length and is free of all tie outs to reduce bulk and over all weight. Lastly the inside has an aluminum coating to reflect back the radiant heat given off by one's body. The SING UL BIVVY is designed to be very light weight, portable, highly water resistant to help keep you warmer and dryer. With the SING UL you can use it in the following ways. Alone as a thermal sleeping bag As a thermal BIVVY with a traditional sleeping bag Emergency shelter Easy to pack and very light. This is a must for any Emergency or Backpacking kit. 35.4*87.7” (90*223cm) BIVVY 9*3.5" (23*9) Packed weight 11.6 oz (328g)The temp rating on the SING UL can be subjective and ranging depending if your using it all the way zipped up, in a hammock, your body type etc., I have continually gained 18 degrees Fahrenheit from the outside ambient air temperature, in my test the Trifecta was mostly zipped closed in temperatures ranging from 0f to 50f. For example if it's 45f outside then inside the Trifecta it should be about 63f
