i was at an outdoors store not long ago asking bout sleeping bags, down vs. synthetic fills, the guy informs me that nowadays they've gone completely over to synthetic fibers as theyre now lighter and warmer than down....which I've always thought down was lighter though not good for wet, so i say ok thanks...
I start looking,right in front of where we had been talking is a board saying....down vs. hollowfill or something....and I was right, down= lighter, synthetic=good when wet.