Giro g9 ski helmet mens this giro g9 ski helmet is engineered with a in form fit system to adjust the fit to a more customised fitting in seconds thanks to its adjustable dial its toughened polycarbonate outer shell is teamed with a impact absorbing foam liner to offer you the greatest support without the bulk and excess weight this helmet is designed with super cool vents to help fresh air to be pulled into the helmet whilst stale air is drawn out weatherstrip vent plugs give you the opt