Ya down or synthetic is still going to compress enough underneath you to possibly make you cold. Not saying it will....there a select few "icemen" here who seem to be able to get sometimes into the 20s without bottom insulation but they seem to be few and far between. I suggest using a pad or investing in a UQ. Also don't worry about synthetic if you have the money to get down. Synthetic bags, especially polyfill, are extremely bulky and will eat up pack space. Only exception I have seen is Primaloft which can be decently pricey stuff (I don't think quite as much as down). I got a primaloft bag at an REI garage sale for cheap the other day though and I have to say I like it. It's almost as light as down. It's packable almost as well as down. I got a 35* bag and I was pleasantly surprised when I took it down to 35* and was still quite toasty. One thing it beats down on is that it looses very little insulating properties when wet where as down becomes almost useless when wet.
Last edited by Rushthezeppelin; 02-22-2009 at 12:37..