Presume you mean magnetic? My friend has her old boy with a magnetic wrap on one leg all year round. He does come in at night in the winter but we are on clay and its muddy! Noticeable difference to his general outlook when wearing it. He is wearing the equi streamz wrap.
The boots I use are bioflow. They recommend they are left on no more than 12 hours out of every 24 hours and they should never be used for turnout only for stable use.