Mophie Juice Pack Air introduced for the Apple iPhone 5; case doubles the phone's battery life6
Both the Air and Helium are slim, but the Air is bigger and heavier. The tale of the tape has the Air at 2.60 in x 5.54 in x 0.63 in and 2.68 oz, while the Helium is 2.49 in x 5.49 in x 0.59 in and 2.44 oz. The Mophie Juice Box Air is $99.95 and will be available in black, red or white. The black case ships in 7 to 10 days while the other two will ship on March 22nd.
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source: Mophie via MacRumors