I'm going on a trip to Yellowstone NP in Jan.  I need some good winter boots.  I wear an 11 1/2 W Men's.  Merrell and Keen my most recent non winter boots.  Been happy with both.  Would like something that is also waterproof.  I've never snowshoed before so I have not idea what I should look for.  What do you recommend?  Preferably something in stock at the Washington DC or Bailey's Crossroads VA stores.  I like to try on boots before buying.  Thanks.