Endurance Vented Safety Helmet Wheel Ratchet and 4 point chinstrap Portwest PS55 Endurance vented ABS shell helmet without retractable visor. Sold with 4 points chin strap included. Features CE certified Vented hard hat allowing a refreshing airflow around the head Lateral deformation 6 points textile harness Wheel ratchet size adjustment for easy fitting 7 years shelf life from manufacturing date outlined in product user sheet Chin strap included Compatible with PW47 and PS47 Clip-On Ear Muff Compatible accessories available Materials ABS