Most comfortable ones we have are ones we built ourselves. All parts are from Wal Mart. I'll see if I can find a pic and post it up.
Here's a couple of liks that will explain it all.
http://discussions.texasbowhunter.com/forums/showthread.php?t=1043
http://discussions.texasbowhunter.com/forums/showthread.php?t=5982&highlight=ground+blind+c hair