This underblanket works well down to the mid 30*f. It fit both my Hennessy as well as my wife's Yukon Outfitters Mosquito hammock. Build quality is very good. It is a bit bulky and heavy for a backpacker. But at this price you have to understand that and accept it. One thing the maker should do is provide better installation instructions. At least suggestions as it will fit many hammocks but each a little differently. All in all a great item and I will be purchasing a second soon.