The following may be helping you decide

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
RAB Ionosphere 5 155 £170