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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.
My point is not how good or bad Airism is. My point is that they call it cotton and its made of almost 50% plastic. Disingenuous and deceptive.