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Zac Efron is taking his off for a good cause (no, unfortunately not because he is hopping into one of our beds) -- he's doing it for charity! The High School Musical alum showed off his toned chest while making skateboards for Lekker Skateboards. The company just released a video, that was soon taken down for copyright reasons but not before we got to see some hot shots of those killer abs!

Last week the 26-year-old tweeted about the experience, "My friend taught me how to make skateboards. Stay tuned to find out how you can win one & help an incredible charity."

In the vid, the Neighbors actor works with various machinery used to make the company’s unique brand of skateboards ... bla bla bla ... we don't care -- we only care that super sexy Zac Efron has no shirt on!