計時帽: Description: The new Giro Advantage 2 is Giros' first CPSC-compliant time trial helmet. Wind tunnel tested by Lance Armstrong and other Giro sponsored pro's - this helmet has been a long time in the making. In-mold construction. 5 vents with internal channeling. Roc Loc 4 fit system. Amongst the fastest helmet ever tested in the wind tunnel and still amazingly light (390 grams).