The 509 Evolution helmet series, came about by request of our customers. Several years ago we asked our fans & customers, what new products would you like to see from 509. Perhaps of no surprise, helmets were the #1 request. Ever since that day, we set out to bring a snowmobile graphics themed helmet into the market at an affordable price. Aside from safety, which is our number one focus, we wanted a helmet that fit our 509 goggles to perfection. The 509 Evolution helmet & Sinister goggle combo fit with perfect precision. Combining the goggle's over-sized foam & large rubber nose-mask, with the helmets wind guard, you will be protected from the harsh wind & snow like never before.