One of the highest rated, most winning and most loved lids you could put on on your head. The Troy Lee Designs D3 Composite Bike Helmet packs an all star combination with its Coolmax™ dual density liner and custom cheek pads so the D3 stays where you want it under full send. Sporting 20 wind tunnel tested ventilation ports you'll be cool and composed mid-way and late into your run. Thanks to a dialed lightweight construction, the Troy Lee Designs D3 Composite Bike Helmet brings comfort, safety and performance to your ride.