The Sleeka Snugpak has a Paratex? outer and inner layer with Softie fill.
Paratex (sometimes Pertex depending on country?) is a nylon ripstop water repellant breathable fabric (or water wicking nylon depending on the description you read), and Softie is a synthetic fill.

I looked into them a while back because I liked the idea of a jacket that I could put in my BOB that came with its own compression stuff sack, and I liked Snugpak's confidence in the synthetic fill's ability to uncompress... Then I thought, "My MSS comes with a stuff sack, but the manufacturer recommends that it should be stored uncompressed"... In the end I couldn't get my hands on a Sleeka to test it out, check the fit, and so on, so I went with something else.

I'm still interested in them, but I'm a "Try it before you buy it" type of person.

I hope my long-winded post helped. LOL <img src="/images/graemlins/laugh.gif" alt="" />