I live on Vancouver Island, so don't have the cold and snow you are dealing with. I have used both Clouds and Stratus boots. I found the Clouds spun on my horses 'bad' (clubby) foot. The Stratus boots are a bit heavier, but stay in place. The insert pad is FAR SUPERIOR and I would recommend them over the Clouds any day. They are very well made and have heavy duty velcro.
Lynn, Dakhyri (IR), Khyara, (IR, PPID)