The Hyfin Vent Compact Chest Seal Twin Pack offers the end user the ideal solution to penetrating trauma to the chest in a compact package. The Hyfin vented chest seals allow air to escape from a sucking chest wound, and in case of an exit wound two chest seals are needed to seal both the entry and exit wound. Non vented chest seals can create a situation where pressure builds in the chest and if not relieved can collapse the lungs making vented chest seals the choice of the CoTCCC (Committee of Tactical Combat Cassualty Care).