I recently received my newest under quilts form Hammock Gear. The first one is half cuben and half mom55 weighing at a scant 10 ounces. The second one is half mom55 and half 7d material. I think they are about the best UQs you can have. I can't wait for some cooler weather to really test them out. I believe the cuben reflects some heat back to you. I always hated putting 4 ounces of down in 8 ounces of shell and with some of the newest materials you can make that a better ratio. I also am showing off my collection. I found HF because I wanted to research UQs. Now look at what you all have done. One more thing. The Cuben UQ is actually a gift for the friend who bought me a titanium whistle. You know who you are. I will send it out with your pack cover if I ever get it done. Enjoy!