The products are cutting edge. The market is booming. The enthusiasm is infectious. Its safe to say that the trend of wearable technology is showing no signs of stopping. Wearables fall into the category of technological devices that a person wears and are capable of tracking data relative to the wearers physical health and exercise. In 2013, activity trackers generated an estimated $290 million in American retail sales, according to Ben Arnold, an analyst at New Yorks NPD Group, who says the market could double this year.