Not nearly as much merino as advertised.
Agree with kspc's comment about the tech specs. These socks do not have 75% merino wool. I never would have bought these, even at SAC prices, if I had known the acrylic content was so high. If your feet do OK with that much Acrylic, these are nice fitting socks. Sadly for me, acrylic=swampy feet, which means they are no good in any weather.