This is the second pair of Sorel's I've owned; my last pair is still in good condition after 7 Midwestern winters but starting to wear a bit.

The size is true to fit - I wear a WM 8M (at the lower end of size 8) & frequently wear heavy socks with these.  They are very comfortable and come just to the bottom of my calf.

The rubber around the foot keeps the feet dry & they have good traction.  They are not overly heavy but they are not like wearing running shoes.  I think they are a good balance of warmth, weight & comfort.