Compatible with ESS Crossbow, Crossbow Suppressor, Crosshair, ICE and ICE NARO eyeshields Increased airflow for fog resistance U.S. Army Authorized (APEL) The ESS High-Clearance U-Rx Replacement Nosepiece comes standard with the ESS-Oakley U-Rx prescription insert. It is compatible with ESS Crossbow, Crossbow Suppressor, Crosshair, ICE and ICE NARO eyeshields. This replacement nosepiece is an essential component of the U-Rx prescription insert. With 8mm of additional stand-off than the Low-Pro Nosepiece, the High-Clearance U-Rx Nosepiece also offers additional fit adaptability for certain users. This extra clearance improves the fit of eyeshields for some users whose eyelashes or cheeks touch the lens when using either the Low-Pro Nosepiece or the Medium-Clearance Nosepiece. It also increases airflow for enhanced fog resistance.