Miah,

The only "winter kilt" I have is my traditional, it is the only wool one I have, and it is great for both summer and winter. All my other kilts are casual, and are just as comfortable in winter as well as summer. I am especially fond of my Bear 4 oz. Maple Leaf. I stay warm in that. Of course I am not hanging out in places like Fraser, Gunnison or some of the colder places in Colorado.