I wouldn't recommend it but it's fine just make sure you horse your horse after. You can use liniment too
If it's over 80 I'd say maybe avoid but it will not do anything except possibly make them sweat. That's my rule of thumb
It's fine but I don't think it's necessary.
It's perfectly fine to use them.
Its fine. But I like boots better so I rarely ever use polos.
It's 10x better than using boots!