PUMAwomens 8 Pack Low Cut Socks Running Socks (pack of 8)

Do they fall down into your shoes too bad, or not really?

The description says these are size 9-11, but the reviews and questions say they are for size 5-8. Which is it?

Is it 8 socks or 8 pairs of socks? Advertising description is not clear.

It says size 9-11, I wear shoe size 5 or 6. Will these still fit well?