I am stumped. I am trying to design a lighter weight sleeping pad system that can stand up to -15 (F) winter temperatures in the White Mountains of New Hampshire.
Today, I use an 27 oz. Exped Downmat 7 that has an R-value of 5.9. It's filled with down, but very bulky in my pack. I'd like to shave at least 5 oz by replacing it with one or more different sleeping pads.
If you have any ideas or anecdotal experiences you can share, I'd appreciate your input. For example, I don't really know what the target R-value I should be shooting for in these conditions is. The Downmat 7 works great, but may well be overkill. I just don't know.
My current sleep system sleep system components for this winter include:
- Western Mountaineering Puma -25F Sleeping Bag (56 oz)
- Mountain Laurel Designs Duomid Pyramid Shelter, Cordage, Stuff Sack (14.1 oz)
- Integral Designs Overbag eVENT Bivy (17.7 oz)
- Exped DownMat 7 Sleeping Pad (27 oz)
The bivy sack is needed to keep the sleeping bag dry with the floorless shaped tarp, but may be my only shelter at times in conjunction with a snow shelter. However, I am not interested in sleeping in these all of the time.
Also, my winter pack is a Cold Cold World Chaos which has an inner sleeping bag pocket that can act as a frame sheet and is large enough to hold a regular-sized Therm-a-rest Z-lite. This is not a constraint, but an opportunity for reduced gear volume in the main compartment since I expect that the best solution will require a combination of multiple pads.
If carrying a pad outside my pack is NOT an option (I don't like it – there are already snow shoes, water bottles, an ice axe, and crampons attached externally), what pad or combination of pads, would you replace the Exped Downmat 7 with?
What do you use for a winter sleeping pad(s) and how cold can you go?
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