NeoAir Xtherm Series

While I may not be going super far, depending on the situation, I could have to hike quickly (closer to 3-4 miles per hour) in order to beat a storm or meet a deadline. I have currently narrowed it down to the themalite xtherm or the Nemo tensor. Leaning torwards the xtherm for the heavier fabric on the bottom.  Big Agnes did offer warranty replacement, however I am concerned about the reoccurrence of the issue so I chose a non insulated pad.  Thanks for the advice!

The Xtherm was a total game changer for me. The warmth from the reflective technology makes a huuuge difference

If the cold is coming through the bottom it’s a pad issue not a quilt issue. I love my Xtherm pad.

I've slept on snow at those temperatures on both the women's X-lite and X-therm. I was quite cold on the X-lite, and I sleep very warm.

Yes. I started with both a Switchback and an Xtherm. Air mattress got holes. I patched it, many times, until I tossed the damn thing and just used the CCF. It was fine. There were only a few nights I wish I had something a bit warmer. When you're riding that edge of too-cold-to-sleep, camp selection becomes even more important.

Adding on to what Massey said **Sleeping bags** At those temps you would want gear rated to handle temps at least at -40F, maybe even -60F depending g on how you sleep and the manufacturer. Many will list the lower limit or survival temp so a -40f bag may only be comfortable down to -15 for you. You are hitting highly specialized gear at this point, even REI has very few bags rated for those temps. I would not try to DIY bag layering with your experience level and those temps. Your choices also break down in to two basic categories - down: lighter, packs smaller, expensive, different care requirements - synthetic: significantly heavier and bulkier but can be much more affordable For down bags western mountaineering is probably the gold standard but bags will be over $1,000. There are a few other major brands in this space but prices will be of a similar range, maybe a few hundred less. There are also some custom gear makers like feathered friends that make down bags in that temp range. For synthetic bags I have used a layered sleep system used by a company called wiggy's. Their two bag system for use down to -40 would take up most of my 60l bag even in the compression sack. I've had it down to about -10 or -15 and was comfy. A large percentage of my scout troop in Alaska used the -40 system from them. The other main synthetic system that I'm familiar with is the military modular sleep system which is supposedly rated to -50 when you use all 3 layers. **Sleeping pads** R value can be additive so you could get one really good pad like a nemo tensor extreme, exped megamat, Therm-a-Rest NeoAir XTherm, or other high r value pad or you could layer multiple closed cell foam pads together and put those on top of a lower r-value Sleeping pad. **Body Sleeping system** Sleeping bags are rated with the following assumptions - the "average" man - wearing base layers - on a well insulated sleeping pad I covered the bag and pad but you also need to have some decent base layers and at those temps you should also be considering what to wear on your head and face. You will probably want to sleep wearing a buff and hat or balaclava and maybe even a hat as well. You want your mouth to be breathing out through the face opening in the bag whenever possible due to condensation buildup. Make sure you have a set of clothes ONLY for sleeping, you want to be completely dry getting in to the bag. **tent** Many tents will work as long as weather isnt a concern. I've used both coleman and ozark trails tent in below zero conditions. The big issue is good ventilation so that any condensation doesn't build up on your bag or on an inner tent wall that may touch your bag and saturate it with water. Double layer tents with a full rainfly would be my go to, especially one with a partial solid interior (the bottom half or so being a solid fabric) that will help block blowing snow and winds. Very few people actually need a dedicated winter tent. In my 4 years in Alaska I never ran in to anyone with an actual 4 season tent and we camped out every month of the year.