With high tech winter wear and proper layering, winter comfort is easy. Start with polypropylene and thermal under layers that releases moisture while retaining heat. Add other heat retentive layers depending on the temperature. Also consider the fact that your forward motion will add to the wind-chill factor. Avoid cottons and sweat shirts which retain moisture, making you cold and clammy which leads to hypothermia.
Good snowmobile wear contains materials that retain heat, release moisture and resist both water and wind. Even better try to find suits that are water and wind proof. Consider wearing an buoyant snowmobile suit if you plan on traveling across ice as they will assist to keep you afloat but most of all help to protect you against hypothermia. . Snowmobile suits should have reflective trim for night visibility. Carry extra clothing, socks, boot liners and mitts for layering. A helmet and face shield combat cold and hazards, while waterproof, insulated boots and leather snowmobile mitts provide warmth and protection.