The JRB Mt washington 3 UQ will excell on that hammock, or any other single camping hammock for that matter... Solid performance to 20*...Some report pushing it further.
There is a true winter model the MW4 if zero or a little below is where on wants to go.
Like always they are in stock...Christmas delivery is no problem for USA.
Ounces to Grams.
... Largest supplier of camping quilts and under quilts...Home of the Original Nest
Under Quilt, and Bear Mountain Bridge Hammock.
800 595 0413