3M Reusable Half Face Masks 6000 Series are made from a lightweight, comfortable elastomeric material with a bayonet-style twin-filter design, cradle head harness and easy-fasten neck strap. The reusable half masks are low profile and are designed for simplicity. They provide protection against gases, vapours and particulates, and feature a bayonet-style connection that fits to a broad range of twin, lightweight filters, depending on your individual needs. The twin-filter design evenly balances weight across the mask, and the low profile means minimal impact to your field of vision and better compatibility with welding and grinding shields.