Check out
this thread or bill here should have the info for Arai.
Shoei's policy from
some website:
Shoei's Free Inspection Policy
Motorcycle helmets are designed to absorb the energy of an accident by being destroyed. Even a small impact can damage the integrity of the shell or EPS liner. This damage may be unnoticeable to the untrained eye, so Shoei recommends that any helmet involved in an impact should either be retired or sent to the manufacturer for inspection. Shoei will inspect Shoei helmets free of charge (minus shipping fees). If you would like to have your helmet inspected, please send the helmet and a letter explaining what happened to the helmet to the following address:
Shoei Safety Helmet Corp.
Attn: Inspection Dept.
3002 Dow St., Suite 128
Tustin, CA 92780 USA
Please remember to include your return address and phone number. We can't send your helmet back unless you provide this information.
Upon receiving your helmet, a Shoei inspection technician will inspect it within three business days and return it to the specified address via UPS Ground with a letter detailing the helmet's condition.