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The impulse peak insertion loss (IPIL) is the standard measure of attenuation provided by hearing protection devices (HPDs) in response to an impulsive noise. This technical memorandum describes the IPIL testing conducted on the Supreme Pro-X Earmuff. Testing included two test modes for the Supreme Pro-X: passive and active. Testing was completed in accordance with the ANSI standard S12.42-2010. All device samples were tested at the nominal levels of 160 and 170 decibel peak (dBP, re: 20 Pa). A total of five samples were fitted to an acoustic test fixture two times each for a total of 10 trials per test level in both the passive and active test modes. The mean and standard deviation (SD) IPIL values were 21.1 (4.3) dB SPL at 150 dBP, 23.9 (3.9) dB SPL at 160 dBP, and 25.7 (2.9) dB SPL at 170 dBP in the passive mode, and 21.0 (3.8) dB SPL at 150 dBP, 23.0 (3.8) dB SPL at 160 dBP, and 25.6 (3.0) dB SPL at 170 dBP in the active mode. Results suggest that the Supreme Pro-X, when properly fit and functional, can adequately protect against impulses below 163.9 dBP in the passive test mode, and 163.0 dBP in the active test mode.