Abstract: An improved half-face mask assembly (10) which can be easily donned and doffed. The assembly includes a hard shell (12), a rubber-like face seal (14), a head harness assembly (16) and two harness anchors and adjusters (18). These parts can be readily assembled or disassembled. Face seals of differing sizes may be assembled to the hard shell. An improved seal is provided between a hard shell (12) and an associated rubber-like face seal (14). A two point head harness suspension system is typically provided althrough an optional neck strap assembly may be utilized with the half-face mask assembly. In addition, a novel one piece harness anchor and adjuster is disclosed.