carson_h wrote:foam --> R2.8, 19oz
prolite --> R3.8, 30oz
downmat9 --> R8.0, 43oz
So the top of the line Exped downmat is lighter than the foam+prolite combo (43oz vs. 49oz), it has a better R value (8.0 vs. 6.6), and it's a much lower volume solution.
Like Caleb, I used to use the women's Prolite. The R value is higher, and the color would scare off most dangerous wildlife.
But the Prolite is still thinner than I like for my back.
Then Britt showed me his downmat. I did the calculations above. Got a DM 9 toward the end of last winter. Used it once in winter so far. ZERO complaints. For it's insulative ability and comfort, it's really not too heavy. BTW - on the gram scale my DM-9 weighs in at 34.5 oz. (Yes, I'm the biggest ultralight weenie you'd want to meet...) IMO, given requirements for the conditiions, I'd say this IS the ultralight solution to a good night's sleep in winter at altitude.
carson_h wrote:The foam pad can't leak/pop so it's a safer solution, but the numbers for the Exped are compelling...
Yes, there is this... So far I've never popped any type of air pad, or had any leak. But a potential liability one must accept.
But FWIW, I've tested the pine-bough method. It works. It is very time-consuming, and not very environmentally friendly, but it's worth remembering in the event of an emergency.
Alan Arnette wrote:FWIW, I used to use the combo Therm-a-Rest Z-Lite (closed cell) plus a Thermarest air but switched to only Exped for all 7 Summits including Denali and Vinson where I was on snow 100% of the climb. Love the comfort as a side sleeper and never felt the cold seep through. The bottom of the ExPed does get wet but didn't seem to matter and dried quickly.
Thank you Alan! This is exactly what I wanted to hear.
I think I'll be very pleased for a long time to come with the Downmat 9 as a winter solution. It also made my sleeping bag way warmer. No more heat to ground.