Quechua, but to be fair they're not fully rigid but enough for crampons so all purpose rather than technical mountaineering. Have had them up to 5,200 metres though
Edit: got height wrong and sounded like I was exaggerating to sound cool
I picked myself up a few base and mid layers last night including some nice merino but Decathlon have got a serious stock shortage at the moment. I suppose that’s down to everyone staying at home for holidays and going camping.
I've got a pair of Quechua mountaineering boots from years back (12 years plus?) And they're great - still going strong.
Obviously for all that tells you about longevity, no idea if the current range are the same / same manufacturing standards...