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Adidas unveils Adipure Trainer, which mimics exercising barefoot $90 shoe hits stores November

Adidas is going barefoot.

The world's second-largest athletic company unveiled its first "barefoot" training shoe Tuesday, which is designed to mimic the experience of exercising barefoot while providing the protection, traction and durability of a shoe. The Adipure Trainer, which is a cross between a glove for the feet and a traditional shoe, hits U.S. stores in November priced at $90.

The barefoot shoe is part of a strategy by Adidas, which is based in Germany, to expand into the U.S. where rival Nike dominates. Adidas joins a list of athletic makers trying to tap into the small but burgeoning U.S. market of fanatical runners and gym-goers who swear by shoes designed with as little material between the wearer and the ground as possible.

"People who believe barefoot is the way to go are very emphatic about it," said Matt Powell, an analyst with industry research organization SportsOneSource Group. "They want to spread the message. It sounds religious, but some of them are evangelical about it."

The athletic shoe and clothing business has been fairly resilient during the U.S. economic downturn, but it is an industry that thrives almost entirely on new products. When it comes to shoes, the latest and greatest captures the U.S. customer. While barefoot shoes make up a tiny fraction of the $22 billion U.S. athletic shoe industry, it is one of the fast-growing categories. Sales have more than doubled in the past year to roughly $750 million, according to SportsOneSource.

Nike, the world's biggest athletic company, holds roughly 65 percent of the market and appeals to barefoot loyalists and mainstream exercise enthusiasts alike with the traditional running shoe look of its "Free" line. Vibram has about 10 percent of the market with its Five-Finger shoe, which encases each toe separately and has come to define the style. Other big companies such as Merrell, Fila, Saucony, Asics and New Balance also have their own barefoot or so-called minimalist offerings.

The growing U.S. barefoot market is an important one for Adidas. The company runs a close race with Nike globally, but the gap is much wider in North America.

In their most recent fiscal years, Nike generated $7.58 billion in revenue in North America. Adidas had roughly $4.05 billion in revenue when translated to U.S. dollars. Nike holds roughly 46 percent market share in U.S., while Adidas comes in at a distant second with about 11 percent of the overall athletic market.

Fans of barefoot shoes say they allow them to better use the body's natural motions and strengths. Some runners say they've also helped reduce injuries. Some weight-lifters appreciate the ability of the shoes to lift without sacrificing their strength or stability to cushioning.

The barefoot culture has long had proponents, but it caught on widely in 2009 after publication of Christopher McDougall's book "Born to Run," which explored the history and benefits of barefoot running. The movement got further attention last year when Harvard biologist and runner Daniel Lieberman published a paper in the journal Nature that concluded that running barefoot seems to be better for the feet, producing far less impact stress compared with those in traditional running shoes.

Shoemakers and health professionals say many of the injuries incurred by barefoot shoe wearers are a result of people using the shoes too quickly. They suggest people trying to make the switch from traditional shoes to barefoot ones do so gradually ---- increasing distance over time ---- to let the body adjust to how the body was naturally meant to move.

"A lot of engineering went into making your foot a high performance machine," said Mark Verstegen, founder of Athletes' Performance, a training and performance organization for elite athletes that works with Adidas. "Using your foot's natural power and movement will help you strengthen muscles you never knew you had in your feet, lower legs and throughout your core."

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