According to the NPD Consumers and Wearables survey, which was taken in December 2014, 54% of fitness tracker owners in the United States were women, while women made up only 29% of smartwatch owners. The survey was taken before the Apple Watch generated increased consumer interest in the smartwatches and, as a result, the NPD Group expects the growing market to eventually overtake fitness trackers. Although smartwatches are not fitness bands, they do perform many of the same functions as fitness wearables.

Research firm Parks Associates estimates that during one point in 2014, as many as 68% of Fitbit owners were women. Of course, Fitbit FIT 4.66% makes its own line of wearables and accessories directly geared towards women, which range from its collaborations with fashion designer Tory Burch to its tiny Fitbit Zip.

From the article "Motorola tackles smartwatch market’s woman problem" by Kif Leswing.