mukluks
vanagon--
I've had happy times with my Steger Arctic Weathermates (now just Arctics).
Warm, breathable, super comfortable. Sometimes I wear them with neoprene socks so I can step out of the muklucks without freezing feet. For snow shoeing, I think they are the lightest warm alternative for dry conditions (36 to 40 oz with felt liners and insoles, the pair). That said, I've yet to get wet feet in them. Do get spare felt insoles. For XC skiing with Berwin bindings: this combination allows you to alternate skiing and shoeing without change of foot gear. The Berwin binding set up is really for slogging along in easy terrain. You don't have the control for other than primitive turns. You can put instep crampons on the mukluks to get out of a jam, but I don't recommend it in general because the soles are soft gum rubber. The mukluks don't come cheap. Call Steger and talk to their personnel if you have questions.
Walt