Klymit’s Ultralight V Sleeping Pad is on Massdrop this morning for US63.74 delivered to Australia ($64.34 delivered to USA address). They have an R rating of 4.4 – enough for the coldest night. You can also pick up one of their excellent pillows for an extra US15. I would go for the 5 foot model (150 cm – 440 grams) which will just fit me (I am 5’7” or thereabouts). So long as your feet don’t touch the ground they won’t be cold – it is a waste carrying a pad longer than yourself, and only makes the pad less comfortable actually. If you miss out here you can get one direct from Klymit for US$119.95. This one is 6 foot long and weighs 431 grams (same R rating) https://www.klymit.com/insulated-ultralite-sl-sleeping-pad.html
If you missed out on one here (I did), you will pick one up later on. They reappear on Massdrop quite frequently (along with lots of other wonderful stuff. Why not join?
A cheaper version of this mat is now available as an in-stock product from US$59.99: https://www.massdrop.com/buy/massdrop-klymit-ultralight-v plus freight (surprisingly cheap).
These mats can be cut down very easily to the desired size, and can weigh well under 400 rams for an R 4.4 mat: https://www.massdrop.com/talk/2026/how-to-shorten-your-massdrop-x-klymit-sleeping-pad