What is the protective footwear horses wear?

Horses were in the picture

I've played horse shoes on occasion.

little b, I’ve been on a shoes horses

Horses can wear rubber over reach boots to stop the back hooves from kicking the front heel pad (behind the pastern bone) They can also wear gel or leather boots to protect damaged or painful hooves, also longer boots for use in the stable or for travelling

I've not been on a shoes horses