Helmet Lners for the Troops

[GinnyG]

Has anyone made the citizensam (http://www.citizensam.org/) troop helmet liners? I just found out about these and would love to give it a try. But in reading the pattern it states that gauge must be EXACT, that even 1/2 stitch will make the size wrong and they will be unusable.

So I am a bit wary of trying it, gauge after all is a variable thing. It seems odd that 1/2 stitch could be so crucial, given the variety in the size of peoples head.

I ordered the suggested yarn but now am concerned that my efforts will be for nothing, if they are not spot on guage wise.