U2, longtime supporters of Amnesty International, are once again helping human rights organization -- they're putting out a T-shirt as part of the Hard Rock Cafe's Signature Series program.

The U2 Signature Series: Edition 30 T-shirt features an electric guitar with angel wings, emblazoned with the words "Justice, Humanity and Equality." A barbed wire is wrapped around the neck of the guitar, and the back of the shirt carries the signatures of Adam Clayton, Larry Mullen, The Edge and Bono.