>>1453422Don't use a three-season tent for four-season activities. Mast of your warmth will come from your Sleeping bag/Air Mattress. Air Mattress will provide R-Value, giving you coverage from the coldness on the ground, sleeping bag will give you warmth. If you are still getting cold, then consider getting a warmer bag, or look at your conditions - is your bag down? Stuffing your 3 season tent so it can't breathe will cause condensation build up in your tent, getting moisture in your bag and causing the down in the bag to stop functioning for warmth. Change to synthetic or Hydrophobic down. This is also the case if you camp in a particularly damp areas. Even during winter.
