Abstract: A face-gaiter mask (10; 100) includes a top seal (14; 100B), a front filter section (10A; 100A), a rear section (100D) and a neck seal (10B; 100C). In use, the front filter section (10A, 100A) is located to the front of the user's face and is configured to cover at least the user's nostrils and the user's mouth. The front filter section (10A, 100A) includes at least two fabric layers (10; 120, 120A, 120B), wherein the at least two fabric layers are configured to provide a predetermined level of filtration and resistance to airflow through the filter section (10A; 100A). The top seal (14; 100B) includes a nose detail (12), which extends from an upper edge of the front filter section (10B; 100B) and extends at least partway into the front filter section (10B; 10 100B). The neck seal (10B; 100C) includes draping fabric, which extends from the front filter section (10B; 100B), the top seal (14; 100B) and a lower edge (17; 23; 117; 123) of the neck seal (10B; 100C).

Abstract: The present invention relates to a fabric sail (1) which maintains a minimal surface. An elastic boundary is attached to the edges of an elastic membrane, and the edges (4) are shaped so that the membrane of the sail maintains a minimal surface configuration despite being deformed by the boundary. The sail therefore distributes strain across the sail surface and is thus free of wrinkles and creases. Points on the elastic membrane itself can be displaced but still form a minimal surface as defined by the boundary and the displaced surface connection points. In addition, strain matching allows the boundary and the elastic membrane to optimally share the strain caused by any deformation.

Abstract: The present invention relates to a fabric sail (1) which maintains a minimal surface. An elastic boundary is attached to the edges of an elastic membrane, and the edges (4) are shaped so that the membrane of the sail maintains a minimal surface configuration despite being deformed by the boundary. The sail therefore distributes strain across the sail surface and is thus free of wrinkles and creases. Points on the elastic membrane itself can be displaced but still form a minimal surface as defined by the boundary and the displaced surface connection points. In addition, strain matching allows the boundary and the elastic membrane to optimally share the strain caused by any deformation.