| Immediate Action's light weight bulletproof helmet Meets NIJ Level IIIA standard and is designed to protect against fragments and ballistic threats. 
  Light-weighted: 1.54kg or 3.69lbsErgonomic design of the internal harness provides ultimate comfortImproved four-point retention system and sling suspension system for added comfort and stabilityBallistic performance tested at NIJ Level IIIA Ballistic Helmet protects against: 
  .44 mag and 9mm bulletsFragmentation ranges from V50 of 500-700m/s Compatible with the Impact Visor. 
  
    | FAST |  
    |  | M | L | XL |  
    | Perimeter | 54 - 58 cm | 56 - 60 cm | 57 - 62 cm |  
    |  | 21.2 - 22.8 inches | 22.0 - 23.6 inches | 22.5 - 24.4 inches |  
    | Long axis | 272 cm | 282 cm | 291 cm |  
    |  | 10.7 inches | 11.1 inches | 11.5 inches |  
    | Short axis | 215 cm | 225 cm | 232 cm |  
    |  | 8.5 inches | 8.9 inches | 9.1 inches |  |