Here's a good video by Shug discussing use of pads in hammocks. At the end he mentions reflectix which is the bubble pad material used by Hennessy.

https://www.hammockforums.net/forum/...ock-Insulation

Shug has many instructional videos on hammocks; have a look at his videos and most likely he answers all your questions.

For an introduction to hammocks and insulation, here's a nice page showing many options.

http://www.tothewoods.net/HammockCampingWarm.html