I am trying to understand the difference between the AMK Emergency Bivvy and the AMK Thermo Lite Emergency Bivvy. Does anyone own both or either.

In case you are unsure here are links to each

http://www.redflarekits.com/pc/1038/s/Heatsheets+BIVVY+SACK%2C+Emergency+Survival+by+AMK

http://www.redflarekits.com/pc/1034/s/Thermo-lite++emergency+bivvy+sack-+1+person

Is it just that one is more durable than the other or is there some other difference. Which is better.