If one wipes over the leather socks and then removes them, does his ritual purity remain?

Question:
Honorable Shaykh, may Allah grant you success. He says: If a person is wearing leather socks and has wiped over them, and then removes them while still in a state of ritual purity, is it permissible for him to pray?

Answer:
The ritual purity is invalidated; because he removed the thing that was wiped over, and the feet became exposed, so he must wash them; because the excuse has ended, which was the wearing of the socks.