Best natural-fiber training wear
A merino polo with the fiber percentage printed on the page, including the synthetic part.
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Training clothes are often synthetic with a natural word in the name. The rule on this site is simple: print the fiber percentage the brand prints, and do not round a blend up to natural.
The shirt
SCROC's Merino Polo 160 Prio long sleeve is 87% merino wool and 13% polyamide. Size M is listed at 195 grams. The brand says it is designed in Austria and produced in Europe, and that the wool is from mulesing-free farms.
Thirteen percent polyamide means this is not an all-natural shirt. It is listed because the fiber content is specific and merino is the majority, and because the brand names fitness among its uses. If you need a garment with no synthetic yarn, keep looking.