Abstract: A footwear system includes an upper portion, a sole portion, and an adjustable heel. The adjustable heel includes a top section configured to the sole portion at a top surface of the top section. The top section defines a top section vertical cavity, a top section upper horizontal cavity, and a top section lower horizontal cavity. A movable top locking pin is positioned at least partially within the top section upper horizontal cavity. A bottom section is coupled to the top section and configured to extend beyond the bottom surface of the top section when extended and to be contained at least partially within the top section vertical cavity when retracted. A movable spring-loaded locking pin is positioned at least partially within a bottom section upper horizontal cavity. The spring-loaded locking pin is configured to hold the bottom section in an extended or retracted position.