Finaly got to use my 1/2 cuben 1/2 momentun under qulit. I stayed warm enough 30* out. Only problem is every 5 inches where the cuben tuched the hammock the under quilt felt cool and where the momentun was felt warm. All I can think is where the cuben was agenst me there was a restriction of my radient heat into the UQ. The othe side being momentum allowed the heat to escape faster. The oppisite was true where the momentum was agenst me. The cuben on the outside slowed heat loss. This had the effect of every other chamber being cooler. Any other ideas.