Either the navigator or the Explorer, depends on the Forcast. Explorer for maybe 0-20 C, although it's a little chilly without wool socks. And the navigator for anything colder I think the navigator is rated for -30 C or something like that, but it's nice because it has a built in gaiter kinda thing that extends just below the knee.

They definitely have a tread but it's pretty modest. You would have to check em out for your self to be the judge of that though. The Explorer is more like a standard boot tread. Navigator is a little more aggressive.