With all the reviews that I read nobody says what clothing they are wearing to bed or are they all sleeping in the buff? I sleep cold so my concern is which bag to get the 25 degree or the 15 degree. I usually sleep in mid weight fleece long johns with a clean pair of hiking socks on in a semi rectangular Sierra Designs 15-25 bag.

It's always a good idea to wear clothing when sleeping in sleeping bags to protect your bag and keep it clean. The oils and condensation from your skin will break down the bag more quickly and not be as heat efficient. I also sleep cold and would recommend the 15 over the 25 - and depending on where you mostly camp, I would even consider getting a 0 degree bag. Even if it is warm out, you can always open up the zipper at the top and bottom to vent. I also always recommend sleeping with a hat and for those very cold nights when you just can't ever get warm, I throw in a couple of mitten/boot disposable warmers (that last for 8 hrs or so), 1 by my feet and 1 by my chest. They burn bare skin though so make sure you're wearing a layer of clothing.
View Details: MontBell America, Inc. U.L. Super Stretch Hugger #1 Sleeping Bag: 15 Degree Down >