This is the new SSC Napoli Macron Fourth shirt for the remainder of the 2013-14 season.
The "Xtreme" shirt is a modified version of Italian club's current "Camo Fight" Away - the appearances of which have apparently been recently limited. Rumours concerning potential intellectual property legal action - over the combination of the camouflage with bright coloured collar and cuffs on the Away shirt - have not stopped the Away being hugely successful in terms of sales, and this new version may follow suit.
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The Away shirt's shades of green in the camouflage have been partially replaced with nods to the Home (blue) and Third (yellow) shirts, in Napoli's first ever Fourth playing shirt, and it will be worn with the Away's shorts and socks.