iSkin today announced that it has added four new iSkin Duo color combinations—Purple Haze (clear on purple), Acid Groove (green on green), Phantom Rave (black on red) and Polar Blast (white on blue).

Designed for the iPod nano, the iSkin Duo features a dual layer shock-resistant silicone skin that “guards against bumps, scratches, dirt, and other unwanted elements, ensuring your tunes keep playing no matter where you go.” The case features a clear screen protector, a wheel protector, removable rotary belt clip, and anti-slip grip surface with side “goose bumps.” The iSkin Duo sells for $30.