An optical fiber cable, comprising: (a) at least one optical fiber transmission medium; and (b) at least one elongated polymeric protective component surrounding at least a portion of said optical fiber transmission medium, wherein said elongated polymeric protective component comprises a polymeric matrix material and a plurality of microcapillaries which extend substantially in the direction of elongation of said elongated polymeric protective component, wherein said elongated polymeric protective component is a buffer tube, wherein at least a portion of said microcapillaries contain a polymeric microcapillary material, wherein said polymeric matrix material has a higher flexural modulus than said polymeric microcapillary material, and wherein said polymeric microcapillary material is selected from the group consisting of an ethylene-based polymer, an olefin elastomer, an olefin block copolymer, a mesophase-separated olefin multi-block interpolymer, an olefin block composite, or combinations of two or more thereof; wherein the ethylene-based polymer is selected from the group consisting of high density polyethylene, low density polyethylene, ethylene ethyl acrylate or ethylene vinyl acetate; and wherein said polymeric matrix material is selected from the group consisting of polybutylene terephthalate ("PBT"), polyethylene terephthalate ("PET"), a polycarbonate, a polyamide, polyether-ether-ketone ("PEEK"), or combinations of two or more thereof. (a) at least one optical fiber transmission medium; and (b) at least one elongated polymeric protective component surrounding at least a portion of said optical fiber transmission medium, wherein said elongated polymeric protective component comprises a polymeric matrix material and a plurality of microcapillaries which extend substantially in the direction of elongation of said elongated polymeric protective component, wherein said elongated polymeric protective component is a buffer tube, wherein at least a portion of said microcapillaries contain a polymeric microcapillary material, wherein said polymeric matrix material has a higher flexural modulus than said polymeric microcapillary material, and wherein said polymeric microcapillary material is selected from the group consisting of an ethylene-based polymer, an olefin elastomer, an olefin block copolymer, a mesophase-separated olefin multi-block interpolymer, an olefin block composite, or combinations of two or more thereof; wherein the ethylene-based polymer is selected from the group consisting of high density polyethylene, low density polyethylene, ethylene ethyl acrylate or ethylene vinyl acetate; and wherein said polymeric matrix material is selected from the group consisting of polybutylene terephthalate ("PBT"), polyethylene terephthalate ("PET"), a polycarbonate, a polyamide, polyether-ether-ketone ("PEEK"), or combinations of two or more thereof. wherein said elongated polymeric protective component comprises a polymeric matrix material and a plurality of microcapillaries which extend substantially in the direction of elongation of said elongated polymeric protective component, wherein said elongated polymeric protective component is a buffer tube, wherein at least a portion of said microcapillaries contain a polymeric microcapillary material, wherein said polymeric matrix material has a higher flexural modulus than said polymeric microcapillary material, and wherein said polymeric microcapillary material is selected from the group consisting of an ethylene-based polymer, an olefin elastomer, an olefin block copolymer, a mesophase-separated olefin multi-block interpolymer, an olefin block composite, or combinations of two or more thereof; wherein the ethylene-based polymer is selected from the group consisting of high density polyethylene, low density polyethylene, ethylene ethyl acrylate or ethylene vinyl acetate; and wherein said polymeric matrix material is selected from the group consisting of polybutylene terephthalate ("PBT"), polyethylene terephthalate ("PET"), a polycarbonate, a polyamide, polyether-ether-ketone ("PEEK"), or combinations of two or more thereof.