The HyFin® Vent Compact Chest Seal Twin Pack provides users with two vented chest seals in a compact packaging designed for the prevention, management and treatment of an open and/or tension pneumothorax potentially caused by a penetrating chest trauma. The cutting-edge design of these chest seals incorporate 3-vented channels designed to allow air to escape the chest cavity during exhalation but prevent airflow from entering through the injury site during inhalation. Each HyFin® Vent Compact Chest Seal is made with advanced hydrogel technology designed to provide a superior adhesion in adverse conditions or austere environments where the casualty may be covered in blood, sweat, body hair, or other environmental contaminants.