Fogging up sucks. I'm sure you've tried everything possible to get rid of the fog. Then you found Exfog and jammed those tubes into your eye pro. The Valhalla Airsoft Integrated Airflow Gasket is designed to provide easy, consistent and safe airflow across the inside of your eye pro to mitigate fogging. These gaskets easily clip onto to ESS Crossbow or Crossbow Suppressor eye pro. Then you can easily insert the Exfog or Noveritsch air flow tubes into the integrated tube guides. Turn on your Exfog or Noveritsch fan and no more fog, no more getting poked in the eye, no more cutting up expensive "HELO Kits" and more fogless pew pew