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Whether you're navigating city streets, ascending a near vertical climb, or steering through aggressive singletrack, the Giro Revel Sport Helmet protects your head, no matter what type of riding you do. Full coverage shell provides excellent impact protection while the 22 vents deliver superior ventilation. Snap-fit visor shields your vision in bright sunshine and detaches when you don't need it. On-the-fly adjustable Acu Dial system makes it easy to custom-tune the fit for maximum comfort and stability.