Answer:
ERP lists the PN521 Red helmet at 0.37 kg. Karam lists four cradle adjustment points and increased vertical clearance.
The ERP lists the Karam PN521 Red safety helmet weight as 0.37 kg. Karam's product specifications list four cradle adjustment points and increased vertical clearance. The ERP description also records a polypropylene co-polymer shell with triple corrugation and an extended nape. Karam's product page lists ratchet-type adjustment.
