A microporous material, comprising: a first layer and a second layer affixed to the first layer, the first layer comprising a microporous material comprising: a first spherulitic matrix comprising a first ethylene chlorotrifluoroethylene copolymer, and a plurality of first pores extending through the first spherulitic matrix, the plurality of first pores having an average pore size greater than about 0.01 micrometer, wherein a spherulitic matrix is a construction that includes a plurality of spaced, randomly dispersed spherulites connected to one another by radiating fibrils, and a spherulite is an individual node or domain of polymer; and a first nucleating agent substantially uniformly dispersed within the first ethylene chlorotrifluoroethylene copolymer, and the second layer comprising a microporous material comprising: a second spherulitic matrix comprising a second ethylene chlorotrifluoroethylene copolymer, and a plurality of second pores extending through the second spherulitic matrix, the plurality of second pores having an average pore size greater than about 0.01 micrometer; and a second nucleating agent substantially uniformly dispersed within the second ethylene chlorotrifluoroethylene copolymer, wherein the first microporous material and the second microporous material comprise different average pore sizes, and optionally wherein the microporous material is a membrane or a hollow fiber. a first layer and a second layer affixed to the first layer, the first layer comprising a microporous material comprising: a first spherulitic matrix comprising a first ethylene chlorotrifluoroethylene copolymer, and a plurality of first pores extending through the first spherulitic matrix, the plurality of first pores having an average pore size greater than about 0.01 micrometer, wherein a spherulitic matrix is a construction that includes a plurality of spaced, randomly dispersed spherulites connected to one another by radiating fibrils, and a spherulite is an individual node or domain of polymer; and a first nucleating agent substantially uniformly dispersed within the first ethylene chlorotrifluoroethylene copolymer, and the second layer comprising a microporous material comprising: a second spherulitic matrix comprising a second ethylene chlorotrifluoroethylene copolymer, and a plurality of second pores extending through the second spherulitic matrix, the plurality of second pores having an average pore size greater than about 0.01 micrometer; and a second nucleating agent substantially uniformly dispersed within the second ethylene chlorotrifluoroethylene copolymer, wherein the first microporous material and the second microporous material comprise different average pore sizes, and optionally wherein the microporous material is a membrane or a hollow fiber. a first spherulitic matrix comprising a first ethylene chlorotrifluoroethylene copolymer, and a plurality of first pores extending through the first spherulitic matrix, the plurality of first pores having an average pore size greater than about 0.01 micrometer, wherein a spherulitic matrix is a construction that includes a plurality of spaced, randomly dispersed spherulites connected to one another by radiating fibrils, and a spherulite is an individual node or domain of polymer; and a first nucleating agent substantially uniformly dispersed within the first ethylene chlorotrifluoroethylene copolymer, and the second layer comprising a microporous material comprising: a second spherulitic matrix comprising a second ethylene chlorotrifluoroethylene copolymer, and a plurality of second pores extending through the second spherulitic matrix, the plurality of second pores having an average pore size greater than about 0.01 micrometer; and a second nucleating agent substantially uniformly dispersed within the second ethylene chlorotrifluoroethylene copolymer, wherein the first microporous material and the second microporous material comprise different average pore sizes, and optionally wherein the microporous material is a membrane or a hollow fiber. a second spherulitic matrix comprising a second ethylene chlorotrifluoroethylene copolymer, and a plurality of second pores extending through the second spherulitic matrix, the plurality of second pores having an average pore size greater than about 0.01 micrometer; and a second nucleating agent substantially uniformly dispersed within the second ethylene chlorotrifluoroethylene copolymer, wherein the first microporous material and the second microporous material comprise different average pore sizes, and optionally wherein the microporous material is a membrane or a hollow fiber.