The Deluxe Retrofit Combat Helmet Liner for Ops-Core helmets with OCC or Worm Dial includes: (1) front pad, (1) large oval rear pad, (1) nape pad, and (8) crown pads (4) 3/4″ and (4) 1″ 
 
The Deluxe Retrofit Combat Helmet Liner for ACH/CRYE/TW type helmets includes: (1) front pad, (1) large oval rear pad, and (8) crown pads (4) 3/4″ and (4) 1″
 
The ACH/ECH Version comes with a 3/4″ brow pad designed to be attached directly to the inside of the helmet shell and should be used for all other helmets that do not have an integral brow pad or if the integral brow pad is being removed. We cannot advise on compatibility with unlicensed Ops-Core replica helmets or other helmets that may share a superficial resemblance to the Ops-Core FAST, however as a general rule of thumb–the Ops-Core Combat Liner should be used for helmets using the Occ-Dial system. All other helmets and configurations should use the ACH/ECH variant.
 
Accommodates: ACH, MICH, LWH, Crye Precision, Ops-Core, MTEK, Revision, Gentex, BAE, United Shield, and others
 
Impact Test: Independent Lab, DoD Testing: Meets/Exceeds ACH Impact Specification, USMC SMART-TE ACH Test
 
Manufactured: USA – Berry Amendment 10 U.S.C 2533a Compliant
 
Fits: ACH/ECH/MICH Helmets