They're adding new features water resistance and Bluetooth 4.0 -- and forging new app partnerships to extend the watch's platform.

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The Nao also has all of the features of its less advanced counterparts: water resistance, a comfortable and easy-to-adjust strap and a rechargeable Li-ion battery that, in a pinch, can be swapped out easily for two AAA batteries.

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Although swimmers and sprinters face no resistance beyond water and air, peak-performance feats in other sports must face strong defenses, which only improve as each sport gains sophistication.

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What: Sony Mobile Communications brings the Xperia advance to US consumers looking for a full-featured Android smartphone and beautiful design with extra durability and water resistance.

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Similarly, the molecules for water resistance can be more expensive than some other molecules, but it costs less than premier chemicals like Gore-Tex.

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