The 3M ultimate FX full face piece reusable respirator FF400 Series is 3M most rugged face piece, providing flexibility in X-Treme environments while still delivering superior comfort and an exceptional field of view. This face piece offers an ergonomic, streamlined design andndash; for lightweight, balanced comfort. For use with all 3M particulate filters and gas/vapor cartridges. Cartridges, filters, parts, and accessories are sold separately.