Called Giro. They said to mail the helmet to them with a brief letter about what's wrong and they'll mail a new one out (as long as it wasn't in an accident). Turn around time of 2 weeks...include return address. Here's their address if you want to mail one in:

Giro

ATTN: Customer Service

1924 County Road 3000 North

Rantoul, IL 61866-9512