The articles in this special section focus on the new era of wearable computing technologies. Technology's presence on the body expands our capabilities and opportunities. Smartphones, MP3 players, Bluetooth earpieces, and fitness trackers are increasingly part of today’s dress code. These devices empower us to communicate, relax, and work out more effectively. The new generation of “wearables” promises to go even further: new technologies will enable these on-body devices to sense and understand our environment and provide just-in-time information in ways that do not distract from the primary task, improving our efficiency and encouraging our creativity.