Granted Hennessy's site is a bit confusing, but I'm seeing that they are all for inside the hammock. They are advertised as "Radiant Bubble Pad is a different insulation system designed to be used inside of the hammock." or "This pad can also be used inside any other hammock model." I'm not really seeing anything else with them. It's too bad they don't really school the people coming to them on what some of the options are. If one was a noobie (me), and they come to their site, it kinda looks like there's just one way to tackle this insulation issue.

http://hennessyhammock.com/collections/insulation