HK Army HSTL GOGGLE w/ Thermal - BlackHSTL Goggle System Composed of a robust blend of thermoplastic, the design of the HSTL face mask protects critical areas of the user, while still promoting supreme breathability and freedom of movement. The HSTL Goggle System features the quick change lens retention system which allows the player to replace their lens in seconds without the use of tools. Details Snap in place removable upper and lower goggle foam insert Optically correct high