Size Medium The PST Helmet is a general duties helmet suitable for military and police tactical use. The helmet is constructed from para aramid material and provides lightweight, robust protection from ballistic and fragmentation projectiles and other low energy threats The latest harness design offers a stable and comfortable fit with individual adjustment capability. This four point harness is anchored to the shell with ballistic resistant bolts. The harness can be easily removed for cleaning or replacement Protection against fragments from V50 of 670 m/sec (2200 fps) according to STANAG 2920 (17gr FSP) and US MIL STD 662F. Meets and exceeds the US Military V50 multi fragmentation requirement for the ACH helmet3 The face protection mechanism works flawlessly!