Abstract: Aspects of various embodiments herein may be implemented as follows. An apparatus has a material shell that conforms to a user's face, and a securing portion connected to the shell that may operate to secure a filter to the user's face with the filter covering the user's nose and mouth. A securing force may be applied to the filter via the first material portion in a direction toward the user's face, thereby sealing the filter around the user's nose and mouth. Various implementations involve elastic and other material that facilitate sealing of the filter around the user's nose and mouth.

Abstract: Aspects of various embodiments herein may be implemented as follows. An apparatus has a material shell, which may be conformed to a user's face, and a securing portion connected to the shell that may operate to secure a filter, such as to the user's face with the filter covering the user's nose and mouth. An adjustable valve is coupled to the filter and operable for providing adjustable air flow through the valve (e.g., selectively bypassing air flow through material of the filter). A securing force can be applied to the material shell, thereby sealing the shell around the user's nose and mouth. Various implementations involve multiple couplers at an attachment region between the material shell and securing portion, which facilitate the application of forces with two or more degrees of freedom for securing to the user's face. Further, various implementations facilitate replacing filters utilized with the mask shell.

Abstract: Aspects of various embodiments herein may be implemented as follows. An apparatus has a material shell, which may be conformed to a user's face, and a securing portion connected to the shell that operates to secure a filter, such as to the user's face with the filter covering the user's nose and mouth. A securing force can be applied to the filter via the first material portion, thereby sealing the filter around the user's nose and mouth. Various implementations involve multiple couplers at an attachment region between the material shell and securing portion, which facilitate the application of forces with two or more degrees of freedom for securing the filter to the user's face. Further, various implementations facilitate replacing filters utilized with the mask shell.

Abstract: Aspects of various embodiments herein may be implemented as follows. An apparatus has a material shell that conforms to a user's face, and a securing portion connected to the shell that operates to secure a filter to the user's face with the filter covering the user's nose and mouth. A securing force is applied to the filter via the first material portion in a direction toward the user's face, thereby sealing the filter around the user's nose and mouth. Various implementations involve elastic and other material that facilitate sealing of the filter around the user's nose and mouth.