Our PRO Mask is completed with the inner filter which is made from 100% pure activated carbon cloth, which was originally invented and designed by the UK Ministry of Defence. It was then extensively developed and made into a product for use in chemical, biological, and nuclear warfare protection, of the type used by armed forces around the world. We hold the exclusive global rights for this material for use in a consumer pollution mask. You won’t find it in any other mask outside of the military.
If you have further questions, please contact us by email at info@cambridgemask.com or Chat button on our sites to connect with our Customer Service Team.