I'm not really convinced..

[SunsetBengal]

You should put that shirt to the test. Start a video documentary, wear that same shirt every day, while refraining from showering during the test, every day for 30 days. Every day, shoot some video of yourself smelling each of your pits, and then smile and say "Still working!". The day you can no longer smile and hold a straight face, we'll know it has reached it's failure point.

Whadaya think? Heck, you could end up with an endorsement deal out of it.