Hello Tim,
Thank you for taking the time to look at the Alien. You can get the Float Foam at:
Bob Marriott's, [url=http://www.bobmarriotts.com/:8ec38]http://www.bobmarriotts.com/[/url:8ec38]
Or go to Rainy's web page and do a search for dealers near you:
[url=http://rainysflies.com/pages/dealers.asp:8ec38]http://rainysflies.com/pages/dealers.asp[/url:8ec38]
I've heard there is round window insulation you can find at hardware stores.
And finally, you can also use Live Body Foam (which I use in the Texas BullFrog) from:
Hunters Angling Supplies [url=http://www.huntersangling.com:8ec38]www.huntersangling.com[/url:8ec38]
Good Luck, and let us know how you do with the Alien.
Cheers,
Richard
Plano TX