Abstract: Example embodiments of the present disclosure comprise adjustable footwear having sole structure with interdependent parts. The sole structure may comprise multiple parts and/or portions that are configured such that relative movement between the multiple parts/portions and/or relative material properties of the multiple parts/portions facilitate and accommodate size adjustability of the sole structure (e.g., adjustability in length and/or width). In various embodiments, the interdependent portions of the sole structure may allow for adjustment in one or multiple directions in response to an action (e.g., a single action) taken by a user.