This year eMarketer estimates wearables usage will grow by roughly 60%, to reach nearly 64 million people.
Most Popular Smart Watch Apps By Gender: Women liked social networking apps the best while men liked sports and gaming apps best.
Smart watch shipments are expected to grow rapidly in 2015 on the back of recent product launches from well-known players such as Apple, Samsung and Sony.
Smart watches were expected to rule the segment, accounting for around 60% of US wearable device sales in 2014.
Price was the top criteria when it came to purchasing a smart watch among smartphone users in the UK, US, Germany and South Korea.