I wear this with a silk lining (from REI), in boots with 200g Thinsulate. My feet sweat and I often catch colds. For me it was the perfect solution this winter.
Pros
Thanks to this lining, my boots have become much warmer even in minus weather. They are not thick but work better than wool socks.
Cons
$27 for overpriced socks... Trust Amazon reviews! To return!