'The Third Thumb' is a 3D-printed robotic wearable designed to enhance users' biological capabilities. Controlled by users' toes, the robotic thumb sits on the side of the palm opposite users' biological thumbs, resembling a sixth elongated finger. It is operated through a pair of sensors under each big toe - pressure applied by the right toe moves the thumb side to side, while pressure from the left toe moves it up and down. The device can be used to complete tasks that would ordinarily be difficult or impossible to perform with just a thumb and fingers. A video demonstrating what The Third Thumb can do is available in the article.