The Nike Free was a groundbreaking running shoe released in 2004, designed to mimic the biomechanics of barefoot running. The brainchild of designers Tobie Hatfield and Eric Avar, the Nike Free was the outcome of extensive research conducted at Stanford University, observing athletes running barefoot on grass. With its innovative design, featuring a flexible outsole with deep sipes for multi-directional flexibility, the shoe allowed for natural foot movements, providing runners a more minimalistic running experience. Collaborations with designers and brands, such as Matthew M. Williams and UNDERCOVER, have led to creative reinterpretations of the Nike Free, keeping the model relevant and popular in both sports and fashion realms. Its enduring legacy lies in its transformative approach to running shoe design, promoting the idea of natural motion in athletic footwear.