The HyFin Chest Seal is a self-adhesive occlusive dressing designed for the treatment and management of an open chest wound caused by a penetrating trauma, such as a gunshot or stab wound. This chest seal utilizes an enhanced adhesive gel formulation designed to create a superior seal even in extreme conditions to treat and manage an open pneumothorax while preventing the development of a ''tension pneumothorax'', one of the top three leading causes of preventable deaths on the battlefield. The HyFin Chest Seal is specifically designed to overcome adverse conditions in austere environments where the casualty may be covered in blood, sweat, body hair, or other environmental contaminants when a reliable chest seal is mandatory. Featuring a large 6 x 6 inch size, the transparent design allows for accurate placement directly over the wound, easily conforming to the chest. A large, easily-visible, red elliptical tab facilitating single step peel-and-adhere application is incorporated into the design. Made in the USA and 100% latex-free, each chest seal is packaged using its signature Red Tip Technology red tear notches in a rugged, easy-to-open, foil pouch to ensure high quality performance.