Answer:
ERP records the helmet at 0.37 kg with a polypropylene co-polymer shell; KARAM lists four cradle adjustment points, ratchet-type adjustment and increased vertical clearance.
ERP records the KARAM PN521 at 0.37 kg and describes a polypropylene co-polymer shell. KARAM lists four cradle adjustment points and ratchet-type adjustment; its product page also notes increased vertical clearance, a soft non-irritant headband and an adjustable chin strap.
