BUY X GET Y
Buy 2 Get a 3rd Free.
There are some collections which can get a 3rd free while you buy 2 items. But not all collections, please pay attention to it.
There is a sentence "Buy Any 2, Get 3rd Free" on the bottom of the collection while the collection is the one.
Hope you guys would kindly understand.
Buy 5 Get a 6th Free.
This promotion just for the socks. Buy 5 pairs of socks, get the 6th pair free.