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The best modular motorcycle helmet has two face shields that you use interchangeably. On the other hand, a snowmobile helmet uses dual lenses.                                                                                                                                                                                                                   Being that both are helmets, many are left wondering; why does a snowmobile helmet require two and not one lens?                                                                                                                                                                                                                  Stay to the end of the post and it will puzzle you no more.                                                                                                                                                                                                                  Why Does a Snowmobile Helmet Require a Face Shield?                                                                                                                                                                                                                  Snowmobiling has many potential risks, especially on the head. And that’s why the rider must have a certified helmet with a lens.                                                                                                                                                                                                                  A snowmobile helmet plays the following roles:                                                                                                                                                                                                                                                                                                                                                                                                                                   Shielding the Face from Twigs and Branches                                                                                                                                                                                                                  Snowmobiling can take you through vegetation. And the face is very delicate. Therefore, the lens protects your eyes from unexpected twigs and branches that may hit your eyes. Anything that hits your eyes midst the ride endangers your security.                                                                                                                                                                                                                  Safety Against Bugs                                                                                                                                                                                                                   Imagine your ski machine traveling at a top speed of 100mph. Then all of a sudden, a bug hits your eye. Such a thing has the potential to destabilize your ride. You therefore need a shield to block such insects from hitting your eyeballs.                                                                                                                                                                                                                   Blocking Off the Cold Wind                                                                                                                                                                                                                  When a skidoo attains high speeds, the effect of the wind on the face is hard to ignore. If you don’t wear a helmet with a shield or goggles, it becomes hard to concentrate on steering your snow machine. That’s because of the cold biting wind on the face.                                                                                                                                                                                                                   The Risk of Using a Single Lens in a Snowmobile Face Shield.                                                                                                                                                                                                                   The best modular snowmobile helmet features dual lenses that are unlike the motorcycle shield. The dual visor in a motorcycle often consists of a clear and tinted lens. That means you can’t use them all at once.                                                                                                                                                                                                                  In low-lit light, the clear shield of a motorcycle helmet finds good use and in bright light, the tinted version takes the lead.                                                                                                                                                                                                                  But the same is not true for a snowmobile helmet. Remember snowmobiling takes place in the ice setting. Let’s assume a snowmobiler wears a helmet that has a single lens.                                                                                                                                                                                                                   Due to the insulation of the helmet, its interior feels slightly warm. And when you breathe out, warm air comes out of the mouth.                                                                                                                                                                                                                  And since the outer lenses are extremely cold, the warm air upon hitting the single lens causes condensation. As a result, the snowmobiler suffers poor visibility due to the fogging effect.                                                                                                                                                                                                                   Why Do You Need a Double Lens in a Snowmobile Face Shield?                                                                                                                                                                                                                                                                                                                                                                                                                                   A double lens is an effective technology in minimizing moisture condensation and fogging issues. The dual lens has a design such that they are closely spaced but not touching one another. Instead, a thin layer of gas separates the two panes.                                                                                                                                                                                                                   The gas between the panes functions as an insulator. Meaning it prevents the outer lens from transmitting the cold temperature to the inner lens.                                                                                                                                                                                                                   By minimizing the inner shield from getting cold, the double lens prevents moisture condensation and fogging.                                                                                                                                                                                                                   A double shield also provides better protection. It can resist knocks or falling objects better than when it’s a single shield.                                                                                                                                                                                                                    Further Ways of Reducing Fogging in a Snowmobile Helmet                                                                                                                                                                                                                  Besides using double shields, Helmet Gurus advocate the following tips for further addressing the fogging in snowmobile helmets:                                                                                                                                                                                                                  Investing in a Heated Electric Shield                                                                                                                                                                                                                  A heated electric shield is another brilliant technology for addressing the moisture condensation on the lenses. The technique employs electric current to produce heat around the edge of the shield. However, it ensures the heat is only sufficient to defrost the lens and not cause further damage.                                                                                                                                                                                                                   The electric shield derives power from two main sources. Some Skidoo machines have backup batteries dedicated to that duty. On the other hand, others tap the current from the machine's power output socket.                                                                                                                                                                                                                   Wearing a Proper Fitting Helmet                                                                                                                                                                                                                  Besides safety reasons, a properly fitting helmet also helps discourage fogging. When you wear a helmet that fits you correctly, it leaves very minimal space for warm air to linger. That increases the efficiency of the antifogging mechanism.                                                                                                                                                                                                                   Breath Deflector                                                                                                                                                                                                                  The warm breath coming out of a snowmobiler’s mouth can increase fogging if it meets the cold pane. For that reason, a breath deflector as the name implies, redirects your breath away from the shield and sightline to flow out.                                                                                                                                                                                                                   Adequate Ventilation                                                                                                                                                                                                                  Ventilation also plays a key role in minimizing moisture condensation in the helmet. When the air inside the helmet heats up, opening the vents for some seconds cools up the temperature. Thus, you need multiple vents to help dissipate the interior temperature fast and so cut down on moisture condensation.                                                                                                                                                                                                                   Make Use of No Fog Mask                                                                                                                                                                                                                  Anti-fog masks make use of a material that stretches (such as neoprene) to the contour of  your face. By doing so it locks out the openings through which the warm breath from the nose or mouth could have escaped to the lens.                                                                                                                                                                                                                  Instead, the no-fog masks channel the warm breath in the opposite direction outwards. However, for high effectivity, you’ll have to do away with the chin skirt.                                                                                                                                                                                                                   Invest in Anti-Fog Gels or Sprays                                                                                                                                                                                                                   Still, you can consider making use of anti-fog sprays or gels. Applying such spray or gel on the lens cuts down the fogging problem. At the same time, other lenses have anti-fogging coating already.                                                                                                                                                                                                                   Keep Your Snowmobile Helmet and the Lens Clean                                                                                                                                                                                                                  Investing in a double lens and electric shield alone isn’t enough to combat fogging problems. You need to go a step further by maintaining a clean helmet. But when cleaning the shields, use mild soap or as directed by the helmet manual.                                                                                                                                                                                                                   After cleaning the helmet, confirm it's dry before using it. And when not in use store your helmet in a cool and dry environment. A damp setting promotes fogging of the lens.                                                                                                                                                                                                                                                                                                                                                                                                                                      A snowmobile is used in a setting where temperatures go even negative. For a snowmobiler to enjoy a comfortable and safe ride, you must have the best modular snowmobile helmet.                                                                                                                                                                                                                   And that calls for effective features for fighting fogging and visibility issues. A snowmobile therefore has a double-lens face shield as an anti fog feature. Besides heated electric shields, proper ventilation, a breath box, and no fog mask also help. 

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