A closure for bottles, said closure comprising a bimodal polyethylene composition comprising: 10 to 70 wt% of a first ethylene copolymer having a melt index I 2, of less than 0.4 g/10min; a molecular weight distribution M w /M n, of less than 3.0; and a density of from 0.920 to 0.955 g/cm 3; and 90 to 30 wt% of a second ethylene copolymer having a melt index I 2, of from 100 to 10,000 g/10min; a molecular weight distribution M w /M n, of less than 3.0; and a density higher than the density of said first ethylene copolymer, but less than 0.967 g/cm 3; wherein the weight average molecular weight M w of the first ethylene copolymer is greater than the weight average molecular weight M w of the second ethylene copolymer; the density of said second ethylene copolymer is less than 0.037 g/cm 3 higher than the density of said first ethylene copolymer; the ratio (SCB1/SCB2) of the number of short chain branches per thousand carbon atoms in said first ethylene copolymer to the number of short chain branches per thousand carbon atoms in said second ethylene copolymer is greater than 0.5; and wherein said bimodal polyethylene composition has a molecular weight distribution M w /M n, of from 3 to 11; a density of at least 0.949 g/cm 3; a melt index I 2, of from 0.4 to 5.0 g/10 min; an Mz of less than 400,000; an ESCR Condition B (10% IGEPAL) of at least 20 hrs, calculated according to ASTM D1693; and satisfies the following relationship: Log 10 I 6 / I 2 / Log 10 6.48 / 2.16 < 1.50 wherein I 2 is the melt index measured according to ASTM D1238 at 190°C using a 2.16 kg weight, and I 6 is the melt index measured according to ASTM D1238 at 190°C using a 6.48 kg weight. 10 to 70 wt% of a first ethylene copolymer having a melt index I 2, of less than 0.4 g/10min; a molecular weight distribution M w /M n, of less than 3.0; and a density of from 0.920 to 0.955 g/cm 3; and 90 to 30 wt% of a second ethylene copolymer having a melt index I 2, of from 100 to 10,000 g/10min; a molecular weight distribution M w /M n, of less than 3.0; and a density higher than the density of said first ethylene copolymer, but less than 0.967 g/cm 3; wherein the weight average molecular weight M w of the first ethylene copolymer is greater than the weight average molecular weight M w of the second ethylene copolymer; the density of said second ethylene copolymer is less than 0.037 g/cm 3 higher than the density of said first ethylene copolymer; the ratio (SCB1/SCB2) of the number of short chain branches per thousand carbon atoms in said first ethylene copolymer to the number of short chain branches per thousand carbon atoms in said second ethylene copolymer is greater than 0.5; and wherein said bimodal polyethylene composition has a molecular weight distribution M w /M n, of from 3 to 11; a density of at least 0.949 g/cm 3; a melt index I 2, of from 0.4 to 5.0 g/10 min; an Mz of less than 400,000; an ESCR Condition B (10% IGEPAL) of at least 20 hrs, calculated according to ASTM D1693; and satisfies the following relationship: Log 10 I 6 / I 2 / Log 10 6.48 / 2.16 < 1.50 wherein I 2 is the melt index measured according to ASTM D1238 at 190°C using a 2.16 kg weight, and I 6 is the melt index measured according to ASTM D1238 at 190°C using a 6.48 kg weight. wherein the weight average molecular weight M w of the first ethylene copolymer is greater than the weight average molecular weight M w of the second ethylene copolymer; the density of said second ethylene copolymer is less than 0.037 g/cm 3 higher than the density of said first ethylene copolymer; the ratio (SCB1/SCB2) of the number of short chain branches per thousand carbon atoms in said first ethylene copolymer to the number of short chain branches per thousand carbon atoms in said second ethylene copolymer is greater than 0.5; and wherein said bimodal polyethylene composition has a molecular weight distribution M w /M n, of from 3 to 11; a density of at least 0.949 g/cm 3; a melt index I 2, of from 0.4 to 5.0 g/10 min; an Mz of less than 400,000; an ESCR Condition B (10% IGEPAL) of at least 20 hrs, calculated according to ASTM D1693; and satisfies the following relationship: Log 10 I 6 / I 2 / Log 10 6.48 / 2.16 < 1.50 wherein I 2 is the melt index measured according to ASTM D1238 at 190°C using a 2.16 kg weight, and I 6 is the melt index measured according to ASTM D1238 at 190°C using a 6.48 kg weight.