Last winter my wife and I borrowed Downmat 7 sleeping pads to try for a Sierra Nevada winter weekend snowshoe trip. They were super comfortable. It was about 15F at night. However, while the pads were clearly warm, it was hard to tell how much warmth the pads offered because:
1) we were using them with borrowed sub-par sleeping bags that were far less warm then rated (they were REI sub-kilo bags) and not wide enough to allow us to take full advantage of our puff insulation clothing;
2) we made the mistake of leaving our Gossamer Gear 3/8 in. Thinlight CCF pads at home last minute because our packs didn’t have enough volume with some group gear (that was a big mistake because the pads are so useful for a long sit pad when cooking in the snow around a group snow “table”).
I’m a big fan of smart backup, and taking a CCF pad with you in winter in addition to an inflatable pad just makes good safety sense. I also like the versatility of systems where you can combine or subtract elements based on conditions (thus instead of a warmer heavier 400 g thinsulate winter boot, we went with the Keen Growler 200 g thinsulate which we can combine with an overboot when necessary and use alone when conditions are milder).
Given that this is for use mostly in the Sierra Nevada and only sometimes in the Pacific Northwest and New England, and that we’ll definitely take our 3/8 in. CCF pads, and that we’ll pick up wider quilts or sleeping bags to allow us to take full advantage of our puff insulation if necessary (Patagonia Micropuff pants and DAS Parka), would you go with a Downmat 7 or 9?
I’m leaning toward the 7, because with a claimed R value of 5.9, and with the GG 3/8 Thinlight at an R value of around 1.42, the combined R value of about 7.3 should approach that of a 9 pad which has a claimed R value of 8.0. Sizes and weights of the various versions of the 7 and 9 are below.
Also, would you choose a Deluxe (wide) version, which is 76 in. L x 26 in. W, and a bit heavier, or a Regular at 70 in. L x 20 in. W? We were going to order the NeoAir in a Large (wide) 72 x 26 in. version to accommodate lots of different sleeping options, side/back/stomach after reading reviews here from many of you. I’m 6 ft 190 lbs with a 42 in. chest, and my wife is 5 ft 6, 130 lbs., athletic build.
If the Downmats came in the same 7.5 DLX size (72 x 26 in.) as Exped’s Airmats, we’d go for that size.
Thanks for your thoughts – so many of you have helped us lighten up, enjoy our trips more and be safer.
GG 3/8 in. Thinlight pad
Weight: 5.3 – 5.7 oz (150 – 162 g)
Dimensions: 19.5 x 59 x 3/8 in (50 x 150 x .953 cm)
R-value: ~1.42
7 Pump: 70" x 20" x 2.8"/178 cm x 52 cm x 7 cm, 31.9 oz./905 g, R value 5.9
7 Pump DLX: 76" x 26" x 2.8"/193 cm x 65 cm x 7 cm, 39.5 oz./1120 g, R value 5.9
9 Pump: 70" x 20" x 3.5"/178 cm x 52 cm x 9 cm, 36.2 oz./1025 g, R value 8.0
9 Pump DLX: 76" x 26" x 3.5"/193 cm x 65 cm x 9 cm, 44.1 oz./1250 g, R value 8.0

