In reply to KS132:
'Soft shell' is, of course, a very broad term...
'Windproof soft shell' is also broad. Wind resistance can be achieved by a closely-woven fabric, or windproofing by a continuous membrane. Which is it you're after?
Then there's warmth: how warm do you want this jacket to be?
I have far too many soft shells, ranging from pure, lightweight wind resistant shells (e.g. Pertex), to membraned shelled fleece. And in all flavours of warmth from no insulation to thick Polartec Thermal Pro in my Patagonia MixMaster (which, sadly, has had the laminate glue fail, and the shell and liner are no longer bonded
).
I have two Decathlon soft shells, one of which is my current favourite for general use. It's a bit like a Rab VR, except that the insulation is hexagonal blocks of flocking bonded to the face, rather than a drop liner like the VR. I have a Rab VR Flex (a review item), which is a pretty similar jacket, but I prefer the Decathlon one as it has body pockets and a hood. Unfortunately, that's all a bit academic, as it's discontinued... (was the Quechua Forclaz 900 'Soft Spread').
I also have a Quechua Forclaz 600 soft shell jacket, which is a pure wind-resistant, stretch, dual-weave fabric (i.e. no membrane, very little insulation). It's rather close fitting, and the hood has no cinching (although there's a sewn sleeve on the brim, so cinching might be added...). Body pockets are well positioned, but rather small. Arm raise is okay, but not brilliant For £28 it's not bad.
https://www.decathlon.co.uk/forclaz-600-m-windbreaker-blk-id_8355668.html
There's a Simond jacket with more features, but I've not seen it. It seems to have a PU membrane. At £35 it may be worth a look, especially considering Decathlon's 365-day satisfaction returns policy.
https://www.decathlon.co.uk/alpinism-mens-light-softshell-grey-black-id_835...
I'm not a big fan of membraned, insulated soft shells, so I've not really looked at any of those offerings from Decathlon. My vague recollection is that the armscye design of the sleeves is a bit 'urban', i.e. closer to a standard tailor's suit block pattern than that required for active use such as climbing.