I have wool sweaters from both M & S and Benetton. My 1980’s M & S botany wool jumpers and cardigan are still in excellent condition - no bobbling or shrinkage. More recent merino wools ones are practically see through, and half the weight of the old ones, and have gone slightly bobbly. I still have Benetton knitwear also from the 80’s and 90’s, which are also brilliant. The ones which I bought from about 2010 onwards have definitely got something synthetic in them, and they feel nothing like the old ones, and have become very bobbly. The older ones have kept beautifully. I haven’t bought any, but on examining the merino knitwear in Hobbs, they feel, to me, that they might keep well.