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Cheers and for the link, though need XL not M so can’t take amey’s generous offer. Think thishttps://www.ebay.co.uk/itm/256136303629?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=u5lFvBbKQmu&sssrc=4429486&ssuid=8rnwzrLuRJ6&var=&widget_ver=artemis&media=COPY] could be a shout, though it is a down alternative
bobble-
Yeah get down not that.
Primaloft gold or climashield apex are the down alternatives. But bulky and degrade quicker. I do wear them aot though.
Look on fbmpIf going decathlon I'd consider the mt100 one. Lighter and less warm. Unless you're someone that is cold, they rate it to 5C static. Wear with fleece and rain jacket to boost warmth. I dunno about decathlon down provenance though.
https://www.decathlon.co.uk/p/men-s-mountain-trekking-hooded-down-jacket-mt100-5-c/_/R-p-167571
skinny
As above take up amey offer or launchpadbois brand recommendations. You'll find something suitable on fbmarletplace/eBay easy. Look for down above 700g and a jacket around 300-400g.
https://www.ebay.co.uk/itm/364360172454?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=_kca__oosdq&sssrc=4429486&ssuid=s3D5DZeWTEu&var=&widget_ver=artemis&media=COPY