Hi Iago, i have a Rab MeCo shirt and overall like it for colder weather use (especially late Fall to early Spring). It would have been too warm for the recent CT trip we did though.
Rab MeCo is a similar percentage ratio as i earlier outlined, but opposite. It’s 65% Merino and 35% treated polyester. I would reverse it and use polygiene instead of Cocona for the polyester (called something else now i think).
I should clarify that my experience with polygiene has not been consistent. While that shirt has some issues with odor, especially over time (hiking for a month, is very different than a few days or even a week, especially since body oils build up cumulatively over time), some other shirts i have with polygiene work better (one is also all polyester, and especially the one that is about half nylon).
I think the science behind polygiene is fairly sound, but i’m not sure if it accounts for the build up of body oils over longer periods of time and like most mass produced products, it’s probably possible to sometimes get a lemon or less than ideal batch.
But more and more, for warmer weather (consistent highs above 60* F), i’m really liking nylon tencel blends. Very tough, durable, and comfortable–the odor control is pretty good (though not as good as pure Merino, Alpaca, Linen, etc), dry times fine, and a bit more cooling.
In case of any further interest on this topic, for the same above trip referenced, for bottoms i used a pair of shorts that are 77% nylon and 23% cotton and Prana Sutra pants that are 53% Hemp, 44% polyester and 3% spandex. I was pretty happy with the combo of their characteristics–odor control, drying time, durability, overall comfort, though slightly less so with weight (all nylon would have weighed less in both cases).
I saved a little weight in that instead of bringing dedicated rain pants, i sewed some velcro to the shorts, and made a corresponding pair of pant “sleeves” to go on that were highly WR (EPIC fabric). Since i used a poncho, i didn’t have to worry too much about the shorts themselves getting wet (poncho covered all but a fraction of the lowest part of the shorts). Worked pretty well, but we were lucky with rain–we had maybe only 4 days total of more serious rain.