I tried www.hennessyhammock.com without success.
But I was able to find a description at REI web site.

Seems like a nice idea, but .....
- what if there are no trees ? .... what is the vegetation cover like, at an altitude of 1800 meters (about 5900 feet) ??
- I really don't know if I will be able to sleep in a hammock ! I'm always twisting, from one side to the other and back .... I have to try it first ...