The Improved Protective Hood (IPH) represents the next generation of chemical biological protective hoods. It is designed to fit snug to the head and incorporates an internal neck dam. The hood features reduce the flow of contaminated air into the head region and eliminate the need for additional neck protection. The IPH is made using both the non-stretch and stretch GORE® CHEMPAK® Selectively Permeable Membrane. Incorporation of the stretch fabric allows for an optimum fit while not impacting freedom of movement. The use of moisture vapor breathable fabrics in the hood enhances the thermal performance of the ensemble. The IPH benefits from an extended service life as the SPM performance does not degrade when removed from the barrier bag or when the fabric is exposed to chemical agents. The IPH rubber face seal also fits with the majority of in service respirators.