This book collects multiple research articles studying the factors influencing wearable device usage. Based on multiple empirical studies, which research different kinds of wearable devices such as smartwatches, activity trackers, and smartglasses, potential drivers of wearable device usage are identified and evaluated. Overall, the book provides novel and important insights for both practitioners and academics, highlights their various practical implications for the development and marketing of wearable devices and offers outlooks on further research directions.