Wearable technology is developing rapidly and will see mainstream adoption in the next five years. It will help record our surroundings, nudge us to action, communicate information between people, control our environments, and reflect our well-being. Key drivers are the evolution of interfaces, sensors, algorithms and free communication across devices. Wearables can introduce technology into new environments and enable hands-free access to information for workers. Main applications areas are healthcare, fitness/activity tracking, and industrial uses. Challenges include uncomfortable designs, clunky interfaces, and reliable network connectivity.