PITTSBURGH (KDKA) — Steeler Nation has grown to “Respect the Beard.”

Steeler and Pro Bowl defensive end Brett Keisel is the latest player to get his own shirt from All Pro Embroidery. The motto? “Fear the Diesel.”

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“It’s been fun and it’s taken off and I just wanted to share a little piece of me with everyone that wants it,” Keisel said.

Brett actually gave All Pro the picture. So the motivation behind that wild look in his eyes?!

“I took the picture one morning just as I woke up,” he said. “And I wanted to do something that people would remember. I think I captured it.”

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Brett’s beard has taken on a life of it’s own with it’s own Facebook page.

There’s even a website where fans try on their on their own Keisel beard.

The “Fear the Deisel” shirt is not authorized by the Steelers or licensed by the NFL, but it is endorsed by Brett Keisel. Part of the proceeds from the shirt will benefit two of Brett Keisel’s charities – Cystic Fibrosis and The Homeless Children’s Education Fund.

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To purchase a t-shirt, visit Brett-Keisel.com or FearKeisel.com.