The following may be helping you decide

ALPKIT
Alpkit Numo
https://alpkit.com/products/numo

RAB

https://rab.equipment/uk/ionosphere-5-sleeping-mat

Review. I have a RAB Ionosphere 5 which works for me - I side sleep and have no problem with this. Not tried it in anything extreme yet.

Website:- Packed Size Regular 23cm x 11cm (9in x 4.3in) / Long Wide 28cm x 12cm (11in x 4.7in)

Name Weight / Grams   Cost
Alpkit Cloudbase 420 https://alpkit.com/products/cloud-base £55 (2025)
Alpkit Numo 350 https://alpkit.com/products/numo £47 (2025)
RAB Ionosphere 5 155 https://rab.equipment/uk/ionosphere-5-sleeping-mat £170 (2025)