I have worn them for 15 hours as liners for both wool socks and cheap cotton socks. They kept my feet cool and dry while walking in warm weather.
My current blister proof system:
With the latest scientific research incorporated!
Not exactly light but very wickey! (no leaks)
I bought four and gave three to others. All seem to like them, but don't know how effective they are. How to they compare with KN95 Masks?