The giro phase womens mtb helmet delivers superior protection and comfort through an accurate women specific fit and ergonomic design capable of high performance riding this giro helmet dials you in to a personalised fit with the renowned roc loc 5 fit system and super fit sizing design the polycarbonate in mould outer shell is effectively impact resistant and cleverly disperses trauma away from the skull in the event of a crash the phase features 27 breezy vents strategically placed for opt