I wear my wool Tekkos to run or walk in, even if it's 95 out.
Next week I am going to Little Lyford Pond Camp, about 60 miles north of Greenville, Maine. It will be in the forties at night, even if it's 75 in the day.
I will be taking my Shak(s), wool hiking socks, and maybe some wool base layers. Frankly, I can't wait.