The drytex hinged knee design for mild to moderate medical lateral controls. Drytex is a neoprene alternative fabric that allows improved airflow. This fabric provides compression and support yet allows for breath ability. Ideal for patients who have allergic or irritation to neoprene or those who live in warm weather climates. Mild to moderate instability of knee joint. Wrap around version for simple fit. You would get one knee support in a pack.