I'm a barrel racer and I do tons of contesting. Right now i'm using smb boots on her fronts legs and polo wraps on the front what to you think? She does have some shin splints but their not acting up at all.
I'm not a western rider, so I don't really know anything about barrel racing, but I do know that polo wraps don't give support. They are used to help keep the leg warm during warm ups. It will not prevent any damage that may occur when you're running barrels.