Size adjustment system for a perfect fit. 10 air intakes, vents mesh covered to prevent debris entry. Inner lining fully detachable and washable. Head lamp holder clips. Two slots for mounting ear defenders. Impact tested to crown: 100 joules. impact tested to sides / front / rear: 90 joules. Non-releasing chin strap. Reflector stickers. Custom branding (MOQ 1000) 5 year lifespan.