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I use a Thermatest Prolite, usually a short -66"x20x1.5, 15oz R 3.2. Can get one here https://www.amazon.com/Therm-Rest-Ultralight-Self-Inflating-Backpacking/dp/B07YDMPNBR/138-8618099-6903143?pd_rd_w=VJsKg&content-id=amzn1.sym.1392ad92-d2f6-490a-8c6c-2c5b53785d2f&pf_rd_p=1392ad92-d2f6-490a-8c6c-2c5b53785d2f&pf_rd_r=5XEV0VGVTK5R3V4AFF39&pd_rd_wg=bs1VL&pd_rd_r=9b24eb35-fbf5-487c-a83d-006dbac63878&pd_rd_i=B07YDMPNBR&psc=1 For$88. 72M, 135 lb, 5'6. Side sleeper with bad back, must have firm need a firm. So I speed up inflation with a Flextail as far as it will go then close the wing and add 4-5 breaths in the cylander. Have not been able to get an all air as firm. Put empty pack under feet. Been ok to upper 20s. To pack:Flatten with Flextail, roll, let out last bit of air, fold in half, then in thirds to get a 10 x 22 ish . Lay in bottom of pack then partway up the back, drop in sleeping bag. Also have a regular, have not tried the newr 2" thick ones but suspicious of the ribbed look.
That's a self-inflating version 4.5 really. Version 5 (2017) is what I prefer and after that was 6 which is Prolite Plus types (1.5" thick). The diamond cuts in the foam indicate is was just after the orange cordura squarish shape was retired. It's probably a Women's by the look. I like version 5 because it has the round foam cuts and a slightly better warmth / quality in my opinion. All the ones I'm refering to are 1" thick, except the Plus varients which are 1.5". I have in my possession v4.0, v4.5, v5.0, and v6.0. I find like the v5 the best for the reasons which make it such a highly sought after pad by others. Old product page for v5.0 1"x36" Model #2026886, round foam cuts (web archive): [https://web.archive.org/web/20171019030308/https://www.thermarest.com/catalog/product/view/id/16524/s/prolite/category/13/](https://web.archive.org/web/20171019030308/https://www.thermarest.com/catalog/product/view/id/16524/s/prolite/category/13/) Product Specs and older 4.0 version [https://imgur.com/a/ooFhEU3](https://imgur.com/a/ooFhEU3) The version 4.0 is official, and 4.5, 5.0, 6.0 are my own just to give continuity and chronology.
Ya, the women's usually are made to sleep a touch warmer too, which is nice. There's a similar one for sale on ebay right now (not mine, no affiliation): [https://www.ebay.com/itm/358340530736](https://www.ebay.com/itm/358340530736)
Thermorest on sale at MEC: [https://www.mec.ca/en/product/6008-252/therm-a-rest-prolite-plus-wv-sleeping-pad-womens?colour=Cayenne](https://www.mec.ca/en/product/6008-252/therm-a-rest-prolite-plus-wv-sleeping-pad-womens?colour=Cayenne) I got my first thermorest for guides around age 10 and used it until 2 years ago when it finally gave but that's about 27 years, so may as well get something good that they can take to uni when they go! :) I know this is women's but it's a pretty good sale, i just don't know if i would pay the extra $50+ given your requirements...
Really depends on your budget, how heavy would be too heavy, and how compact you need the packed pad to be. Something with an R-value around 4 or 5 should be fine if the temps will not dip below freezing. Good brands include Therm-a-Rest, Big Agnes, Nemo, Sea to Summit, Exped. If you are dead set on the self-inflating type (foam in an airtight cover) the Therm-a-Rest Prolight Plus series are a burly older design that is not quite as comfortable nor packs as small or light as the newer inflatables, but is a step up from a simple foam pad. Price is not too bad, either.
No experience with the new one. I much prefer my small prolite plus to my xlite. I find it alot more comfortable. It also makes a great frame sheet for a frameless pack.
I personally prefer a more durable sleeping pad for the weight penalty. Self inflating pads make the perfect frame for frameless packs. I’ve had great success with the old prolite that wasn’t as warm or thick.
I went with the S2S ether light XT wide. I think it is 4" / 10 cm thick whereas my previous thermarest prolite was 5cm... My hip needs 10cm. At the minimum.
I used just a foam pad on my fist thru and it was perfectly fine warmth wise. I switched because I was getting a lot of hip pain. But I do really dislike the thicker inflatable pads like the Neo air so I use the thermarest pro lite. As a side sleeper I love it and have used that pad for the whole triple crown and then some. I also use the short version as you were thinking. Works great imo. I still carry six panels of a foam pad to sit on during the day and such as well. I think they maybe don’t make the pro lite anymore but recently saw this cheap version, seems like it’s basically the same thing. [https://ultralightoutdoorgear.co.uk/superlite-25-short-self-inflating-mat/](https://ultralightoutdoorgear.co.uk/superlite-25-short-self-inflating-mat/)
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