Hmm, I just briefly looked and couldn't figure it out.

However, unlike Pearl Izumi, Plus 3 Network has an excellent response time to customer questions. In the "make it better" section I found the email for this stuff and have already heard back.

Email: letitiadavis at plus3network.com

PS -- Just a note that Pedro's marketing manager also emailed me back within the hour when I sent a "bravo" note.