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That's totally normal these days, just look at Sportwool, it is:
It is a lightweight, composite fabric consisting of a layer of machine-washable superfine Merino wool next to the skin and a layer of tough, easy-care polyester on the outside.
but somehow that's not mentioned anywhere
https://tbfabrics.com/fabrics/sportwool-merino-perform/
https://www.pearson1860.com/products/road-short-sleeve-merino-jersey-to-brightonand this is a merino t-shirt now
https://www.rapha.cc/gb/en/shop/mens-trail-merino-long-sleeve-t-shirt/product/AGV01LSAPAIn the case of Airism I see the cotton as a negative and only get the full synthetic versions.
Dude. Airism is amazing.
I backpacked and toured with Airism boxers, pack to nothing and dry fast. In the summer I wear Airism vests under work shirts to keep me cool.
The vests have lasted incredibly well too. So while plastics in garments typically cannot be recycled further you're not replacing them all the time.