I LOVE merino wool at ALL temps! I run in Smartwool or Point 6 socks. On the bike it's Smartwool or Darn Tough or Icebreaker. LOVE! I love my wool Buff and wool jersey, too. Though I am not totally sold on the 2 Smartwool baselayer tops I have. They don't wick particularly well. I sweat a LOT, so it's probably more me than the wool.