A polymer blend comprising: (i) at least one ethylene/α-olefin interpolymer, wherein the ethylene/α-olefin interpolymer is a block interpolymer and: (a) has a M w /M n from 1.7 to 3.5, at least one melting point, T m, in °C (degrees Celsius), and a density, d, in g/cm 3 (grams/cubic centimeter), wherein the numerical values of T m and d correspond to the relationship: T m > − 2002.9 + 4538.5 d − 2422.2 d 2, or (b) has a M w /M n from 1.7 to 3.5, and is characterized by heat of fusion, ΔH in J/g, and a delta quantity, ΔT, in °C (degrees Celsius) defined as temperature difference between the tallest DSC peak and the tallest CRYSTAF peak, wherein the numerical values of ΔT and ΔH have the following relationships: ΔT > -0.1299(ΔH) + 62.81 for ΔH greater than zero and up to 130 J/g, ΔT ≥ 48 °C for ΔH greater than 130 J/g, wherein the CRYSTAF peak is determined using at least 5 percent of the cumulative polymer, and if less than 5 percent of the polymer has an identifiable CRYSTAF peak, then the CRYSTAF temperature is 30 °C; or (c) is characterized by an elastic recovery, Re, in percent at 300 percent strain and 1 cycle measured with a compression-molded film of the ethylene/α-olefin interpolymer, and has a density, d, in g/cm 3 (grams/cubic centimeter), wherein the numerical values of Re and d satisfy the following relationship when the ethylene/α-olefin interpolymer is substantially free of a cross-linked phase: Re > 1481 − 1629 d; or (d) has a comonomer content of the TREF fraction which elutes between 40°C and 130°C greater than or equal to the quantity (-0.2013)T+21.07 where T is the numerical value of the peak elution temperature of the TREF fraction measured in °C; or (e) is characterized by a storage modulus at 25 °C, G' (25°C), and a storage modulus at 100 °C, G'(100 °C), wherein the ratio of G'(25 °C) to G' (100°C) is from 1:1 to 10:1; and (ii) at least one branched polyolefin with a branching index of less than 1. (i) at least one ethylene/α-olefin interpolymer, wherein the ethylene/α-olefin interpolymer is a block interpolymer and: (a) has a M w /M n from 1.7 to 3.5, at least one melting point, T m, in °C (degrees Celsius), and a density, d, in g/cm 3 (grams/cubic centimeter), wherein the numerical values of T m and d correspond to the relationship: T m > − 2002.9 + 4538.5 d − 2422.2 d 2, or (b) has a M w /M n from 1.7 to 3.5, and is characterized by heat of fusion, ΔH in J/g, and a delta quantity, ΔT, in °C (degrees Celsius) defined as temperature difference between the tallest DSC peak and the tallest CRYSTAF peak, wherein the numerical values of ΔT and ΔH have the following relationships: ΔT > -0.1299(ΔH) + 62.81 for ΔH greater than zero and up to 130 J/g, ΔT ≥ 48 °C for ΔH greater than 130 J/g, wherein the CRYSTAF peak is determined using at least 5 percent of the cumulative polymer, and if less than 5 percent of the polymer has an identifiable CRYSTAF peak, then the CRYSTAF temperature is 30 °C; or (c) is characterized by an elastic recovery, Re, in percent at 300 percent strain and 1 cycle measured with a compression-molded film of the ethylene/α-olefin interpolymer, and has a density, d, in g/cm 3 (grams/cubic centimeter), wherein the numerical values of Re and d satisfy the following relationship when the ethylene/α-olefin interpolymer is substantially free of a cross-linked phase: Re > 1481 − 1629 d; or (d) has a comonomer content of the TREF fraction which elutes between 40°C and 130°C greater than or equal to the quantity (-0.2013)T+21.07 where T is the numerical value of the peak elution temperature of the TREF fraction measured in °C; or (e) is characterized by a storage modulus at 25 °C, G' (25°C), and a storage modulus at 100 °C, G'(100 °C), wherein the ratio of G'(25 °C) to G' (100°C) is from 1:1 to 10:1; and (a) has a M w /M n from 1.7 to 3.5, at least one melting point, T m, in °C (degrees Celsius), and a density, d, in g/cm 3 (grams/cubic centimeter), wherein the numerical values of T m and d correspond to the relationship: T m > − 2002.9 + 4538.5 d − 2422.2 d 2, or (b) has a M w /M n from 1.7 to 3.5, and is characterized by heat of fusion, ΔH in J/g, and a delta quantity, ΔT, in °C (degrees Celsius) defined as temperature difference between the tallest DSC peak and the tallest CRYSTAF peak, wherein the numerical values of ΔT and ΔH have the following relationships: ΔT > -0.1299(ΔH) + 62.81 for ΔH greater than zero and up to 130 J/g, ΔT ≥ 48 °C for ΔH greater than 130 J/g, wherein the CRYSTAF peak is determined using at least 5 percent of the cumulative polymer, and if less than 5 percent of the polymer has an identifiable CRYSTAF peak, then the CRYSTAF temperature is 30 °C; or ΔT > -0.1299(ΔH) + 62.81 for ΔH greater than zero and up to 130 J/g, ΔT ≥ 48 °C for ΔH greater than 130 J/g, (c) is characterized by an elastic recovery, Re, in percent at 300 percent strain and 1 cycle measured with a compression-molded film of the ethylene/α-olefin interpolymer, and has a density, d, in g/cm 3 (grams/cubic centimeter), wherein the numerical values of Re and d satisfy the following relationship when the ethylene/α-olefin interpolymer is substantially free of a cross-linked phase: Re > 1481 − 1629 d; or (d) has a comonomer content of the TREF fraction which elutes between 40°C and 130°C greater than or equal to the quantity (-0.2013)T+21.07 where T is the numerical value of the peak elution temperature of the TREF fraction measured in °C; or (e) is characterized by a storage modulus at 25 °C, G' (25°C), and a storage modulus at 100 °C, G'(100 °C), wherein the ratio of G'(25 °C) to G' (100°C) is from 1:1 to 10:1; and (ii) at least one branched polyolefin with a branching index of less than 1.