The 509 Sinister X5 was completely re-engineered from the ground up and is a significant improvement over our original Sinister in almost every way. We focused on meticulously improving the most important features of a snowmobile goggle. The result is a 509 Sinister X5 goggle with vastly improved visibility, anti-fog, and durability. There simply has never been a snowmobile goggle of this caliber on the market!
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