ABC smooth twill - decent for Fall/Winter?

My most recent pair of ABCs were smooth twill, bought in the Spring earlier this year. They feel a lot better than my previous pair in Versa twill. Smooth twill does feel kind of light, so I’m wondering how it is in Winter. I live in Toronto so there will surely be some colder days but then again I typically wear heattech underneath… or simply a warmer pair of pants. Not suggesting that these pants have to hold up against the elements day in and day out, just want to know if it can be a part of the rotation or not.