Troy Lee Designs continues its domination in the world of full-face head protection with the D2 Bike Helmet. The D2's aerospace composite shell features an aerodynamic design and custom graphics that made Troy Lee a world-famous name. The Hi-Flow ventilation system combines four intake and four exhaust vents to keep your head cool when the riding gets critical. This lid has fully interchangeable, replaceable, and washable padded liners. Strong, lightweight, and stylish aluminum hardware hits round out this helmet.