Directional 3 Channel Vents: 3 Vent Channels that prevent airflow into the chest cavity during inspiration while allowing air to escape through the vent Channels during exhalation. Strong Adhesion Wound Dressing: Advanced Self Adhesive technology for a superior seal In the presence of blood, hair sweat and sand or when submersed in water. Emergency Wound Closures: Zero touch placement,highly breathable, this dressing bandage protects cuts and scrapes. Transparent: Allows for visual placement over wound.Easily sticks to any part of the body and also easily peeled off. Must Have First Aid Supplies: Perfect for protecting wounds such as cuts, scrapes, stitches ect.Just add it to your first aid kit and be prepared for any emergency. Feature: 1.Emergency Wound Closures 2.Directional 3 Channel Vents 3.Transparent, allows for visual placement over wound 4.Convenient to Use Specification: Material: PE material Size: 5.8x4.5cm/2.28x1.77inch Package Includes: 1/2/3 Box Vent Chest Seal Feature: 1.Emergency Wound Closures 2.Directional 3 Channel Vents 3.Transparent, allows for visual placement over wound 4.Convenient to Use Specification: Material: PE material Size: 5.8x4.5cm/2.28x1.77inch Package Includes: 1/2/3 Box Vent Chest Seal