I purchased these for my wife who didn't actually like them, but couldn't explain why. I even asked her about specific parts of the sock and she said they were warm and they fit, she just prefers thin socks.
They're not advertised as thin socks, and I've not actually seen winter thermal socks that would be considered 'thin' so in my view the socks do what they say on the box.
These socks are terrible. They are warm but they are so loose they could fit on the foot of an elephant. They are so loose they literally fall off as you take your foot out of your shoe and bunch up in your shoes even tight fitting ones. The only saving grace is that my feet don't freese. probaly cos they are surrounded by so much sock!