I got the buy 5 and get 2 for free.
Then I wanted to get a bigger size for one pair of the slippers, but they were all sold out. Then I send that one back. Which I had to pay myself. Then I got 5 euro back, because it was one of the free pairs. So in the end I paid more for sending it back than they returned to me. What a scam!! How is it my fault everything is sold out?! There should be a better compensation. I asked for that and after that they ignored my emails.