I have the Sea to Summit Comfort Plus Self-Inflating in size Large, and 8 cm thick self-inflating, and by gees it's comfortable.
It's a 5 out of 5 comfort. It's similar to the Exped Megamat in terms of comfort; and as comfortable as my mattress at home.
It's a wacking 1.2 kg for large, (1.167 on my scale), and relatively bulky at 33 x 17 cm pack size. I've gone out hiking with lighter options, but I tend to still take the Sea to Summit Comfort Plus because I sleep so well on it, that for me it's usually worth the weight. It's R value is 4 - 4.1.
You can see how many 5 star reviews everyone has given it: Link here:
https://www.snowys.com.au/comfort-plus-si-sleeping-matI recommend it for:
- Weekend and short-ish hikes where it's important to be comfortable and get a good night's sleep. I took it on the Overland Track for 5 nights where all my set-up was relatively light except my mat.
(I wouldn't take it on a long thru-hike, like the AT or PCT, where being as light as possible is so important due to the miles you're doing, and also you've got days and days and days to get used to a mat.)
- I'd also recommend it for people trying to get a reluctant partner into hiking. Having a really comfortable warm sleeping pad which they can easily fall asleep on makes a bit difference convincing them to go hiking again.
I also have a 5 cm thick Thermarest anniversary mat, which is similar to the Prolite Plus but is 5 cm thick, and that's a slightly lighter and slightly less bulky option - 680 grams for small size and 900 grams for large size, with an R value of 4. It was a special limited edition release, and no longer made, BUT...
there's a seller down in Tasmania which has old stock. He stubbornly doesn't drop the price even though it's old stock. However if you're interested to take a look it's here:
https://www.gumtree.com.au/s-ad/west-ho ... 1173330944I'm happy with my Thermarest 40th Anniversary mats, but I tend to still prefer to take the thicker / more comfortable Sea to Summit Comfort Plus SI mats, if the weight and pack size isn't a concern. If I have to save weight, I take the small Thermarest 40th Anniversary at 680 grams with me, which I find ok but a compromise of weight for comfort - in that it's too narrow and not nearly as plush. The large 40th anniversary is more comfortable with the large size width, but at 900 grams, it's only a marginal addition to take the Sea to Summit at 1.167 kg and gain the extra plush mattress underneath me.
For the mats you were looking at:
I personally find 3.8 cm thick mat too thin for my hips, unless I blow it really really firm, and then I find it like sleeping on a rock. Too hard and not suitable for me - and for 1 kg you can get so much more comfortable mats for that weight. (eg Thermarest 40th Anniversary mat in size Large, 5 cm thick, for 900 grams; or Sea to Summit Comfort Light SI at 5 cm thick, for 880 grams.)
MOST COMFORTABLE - 8 cm thickness and large size with plush topper. Cons: bulky, heavyier
Sea to Summit Comfort Plus SI - Large -
https://www.snowys.com.au/comfort-plus-si-sleeping-mat (198 x 64 cm, Weight 1.2 kg, R value 4.1, pack size 33 x 17 cm) $204.90
PRETTY COMFORTABLE - 5 cm thickness and large size. Cons: lower R value of 2.7
Sea to Summit Comfort Light SI - Large -
https://www.snowys.com.au/comfort-light-si-sleeping-mat (198 x 64 cm, Weight 880 grams, R value 2.7, pack size 34 x 15 cm) $169.90
PRETTY COMFORTABLE - 5 cm thickness and large size with good R value of 4.0. Cons: The dot-cored foam is not as comfortable as the triangular delta core cut Sea to Summit Comfort SI mats, but not far off.
https://www.gumtree.com.au/s-ad/west-ho ... 1173330944 (198 x 63 cm, Weight 900 grams, R value 4, pack size 32 x 13 cm) $229.95
Best,
Emma