Nokian RSI and Nokian Hakkapeliita's are full blown winter only tires for maximum traction on snow and ice. The Nokian WRg2 or Nokian WR AWP are the all-weather year round tires that can be driven in snow and ice. There are many snow tire manufacturers (Bridgestone, Dunlop, Michelin, etc.), but Nokian owners seem to be the happiest from what I read. They're kinda pricey though. Recommend getting wheel locks to avoid having them stolen, and maybe a 5th tire and wheel for a matching spare. Forget about all-season tires - you'll want snow tires.