The 3M Secure Click Particle Filter D7935, P3 R, is a lightweight filter that combines protection and comfort. Used fourfold (2 pieces on each filter side), it offers low breathing resistance and a good balance with an optimal field of vision when combined with the gas/vapor filters from the D8000 series. As a combination filter, it can be quickly and easily clicked into place with the 3M Secure Click HF 800(SD) half mask series. To connect with the gas/vapor filters, you will additionally need the filter cover D701.