iSkin today announced the availability of its iSkin Shuffle Duo, a dual layer protective skin covering engineered specifically for the iPod Shuffle. The iSkin Shuffle Duo features a design that includes both an inner and outer skin that combine to create a barrier against impurities and moisture. The new protector also leaves all control buttons accessible, as well as the operation status and battery lights visible. iSkin Shuffle Duo is priced at US$19.99.