On Mon, 22 Jun 2009 08:21:52 -0400, Papa Tom wrote:

Of the bits I've seen, that is always too thin.

Double it? Triple it? I don't believe this foam has a lot to do with
absorbing the impact, anyway. As far as I know, it's only there to
improve the fit of the helmet.

Too thin in both dimensions. You'd want something an inch wide.