under 75? That is ridiculous. Unless the horse is worked ALOT just leave the winter coat. Horses grow winter coats for a reason. If you don't want to deal with the thick winter coat just clip them. As long as you keep him blanketed which I definitely don't think you'd have a problem with then just clip. I live in SC and my trainer puts a blanket on when it gets below 50 I think. I blanket when its under 40. And our one clipped horse is blanketed under 60.