Let me explain a bit more. When I go winterhiking the temperatures can drop to 0 - 5 deg F.
So, should a pad work (wich I have, a Exped DLX) or should I get an UQ?
Which can get very expensive because we don't know that in the Netherlands...
And what about weight?
At zero F I'd say both an UQ and a pad. Since you have a Hennessy the obvious choice is a JRB Nest. The Exped pad is an inflatable? Those together should take you to zero with no problem.