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Shearlife t1_iz43qfk wrote

Well, the theory goes that any wool fibre larger than 25 micron in diameter will not bend when in contact with your skin. Hence the distinction between finewool and strongwool. Ultrafine Merino is somewhere around 15 micron, while a Scottish blackface is 28 to 38. https://domesticanimalbreeds.com/scottish-blackface-sheep-breed-everything-you-need-to-know/ https://www.woolmark.com/fibre/what-is-merino-wool/

Finewool feels soft, strongwool itchy - but everyone is different so it's not set in stone -.-/

Synthetic fibre is indeed incredible, but carries the not so small problem of microplastic: https://www.plasticsoupfoundation.org/en/2021/03/the-invisible-threat-microplastics-from-your-clothes/

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