I bought a Loop Rautas jacket just before lockdown and haven't had the opportunity to test it yet. It appears to be well made and was just what I was looking for in a lightweight, packable jacket. It's marketed as a hiking jacket but it's so light it can be tucked under and secured with the hem cord when wading. The most important aspect for me was the breathability and the spec says it breathes as good as Loop's Lainio, which was their top of the range, heavier jacket. Not cheap even at the sale price, but as they say, you pays you money etc.
The Rautas is currently on sale at the FFC here:
The Rautas LW Hiking jacket is designed to be your lightweight shelter when you don’t require huge amounts of gear for the day.
www.ffcentre.com
Here's a review of the jacket:
The Loop Rautas jacket is a minimalist lightweight jacket for the fly fisher which looks good, is well made and shed's water perfectly. It's just as waterproof and breathable as the more expensive Loop Lainio wading jacket and is suitable for use on the bank or when wading.
flyandlure.org
Hope this helps.
Regards
NH