Splint boots and bell boots?

I feel kinda stupid asking this but what is the point of splint boots and bell boots?

Splint boots: to prevent ankle knocking, and extra leg support and protection.

Bell boots: Basically the same as over reach-boots only without the ankle support....and just incase you don't know over-reach boots prevent a horse from tearing up the back side of the front ankles with their back feet due to over reaching with the back legs.

I know this cause I actually use both splint boots and over-reach boots...my friend uses bell boots lol Only her horse does over reach I just use mine for the extra leg protection and support. :)

Splint Boots and Brushing Boots do nothing, but prevent from knocks and knicks. They do not support what-so-ever.