A polyethylene polymer composition comprising 97.0 to 99.9 wt% of a metallocene-catalysed multimodal polyethylene copolymer, which consists of (i) 30.0 to 60.0 wt% of an ethylene polymer component, and (ii) 40.0 to 70.0 wt% of an ethylene polymer component, whereby the ethylene polymer component has a density in the range of from 920 to 980 kg/m 3, an MFR 2 (190°C, 2.16 kg, ISO 1133) in the range of from 2.0 to 250.0 g/10 min, the ethylene polymer component has a density in the range of from 880 to 970 kg/m 3, an MFR 2 (190°C, 2.16 kg, ISO 1133) in the range of from 0.01 to 1.0 g/10 min; whereby the multimodal polyethylene copolymer has a density in the range of from 910 to 970 kg/m 3, an MFR 2 (190°C, 2.16 kg, ISO 1133) in the range of from 0.1 to 3.0 g/10 min and a ratio of the MFR 21 (190°C, 21.6 kg, ISO 1133) to MFR 2 (190°C, 2.16 kg, ISO 1133), MFR 21 /MFR 2, in the range of from 22 to 50 and 0.1 to 3.0 wt% of a polyethylene wax, wherein components and add up to 100.0 wt%. 97.0 to 99.9 wt% of a metallocene-catalysed multimodal polyethylene copolymer, which consists of (i) 30.0 to 60.0 wt% of an ethylene polymer component, and (ii) 40.0 to 70.0 wt% of an ethylene polymer component, whereby the ethylene polymer component has a density in the range of from 920 to 980 kg/m 3, an MFR 2 (190°C, 2.16 kg, ISO 1133) in the range of from 2.0 to 250.0 g/10 min, the ethylene polymer component has a density in the range of from 880 to 970 kg/m 3, an MFR 2 (190°C, 2.16 kg, ISO 1133) in the range of from 0.01 to 1.0 g/10 min; whereby the multimodal polyethylene copolymer has a density in the range of from 910 to 970 kg/m 3, an MFR 2 (190°C, 2.16 kg, ISO 1133) in the range of from 0.1 to 3.0 g/10 min and a ratio of the MFR 21 (190°C, 21.6 kg, ISO 1133) to MFR 2 (190°C, 2.16 kg, ISO 1133), MFR 21 /MFR 2, in the range of from 22 to 50 and (i) 30.0 to 60.0 wt% of an ethylene polymer component, and (ii) 40.0 to 70.0 wt% of an ethylene polymer component, whereby the ethylene polymer component has a density in the range of from 920 to 980 kg/m 3, an MFR 2 (190°C, 2.16 kg, ISO 1133) in the range of from 2.0 to 250.0 g/10 min, a density in the range of from 920 to 980 kg/m 3, an MFR 2 (190°C, 2.16 kg, ISO 1133) in the range of from 2.0 to 250.0 g/10 min, the ethylene polymer component has a density in the range of from 880 to 970 kg/m 3, an MFR 2 (190°C, 2.16 kg, ISO 1133) in the range of from 0.01 to 1.0 g/10 min; a density in the range of from 880 to 970 kg/m 3, an MFR 2 (190°C, 2.16 kg, ISO 1133) in the range of from 0.01 to 1.0 g/10 min; whereby the multimodal polyethylene copolymer has a density in the range of from 910 to 970 kg/m 3, an MFR 2 (190°C, 2.16 kg, ISO 1133) in the range of from 0.1 to 3.0 g/10 min and a ratio of the MFR 21 (190°C, 21.6 kg, ISO 1133) to MFR 2 (190°C, 2.16 kg, ISO 1133), MFR 21 /MFR 2, in the range of from 22 to 50 and a density in the range of from 910 to 970 kg/m 3, an MFR 2 (190°C, 2.16 kg, ISO 1133) in the range of from 0.1 to 3.0 g/10 min and a ratio of the MFR 21 (190°C, 21.6 kg, ISO 1133) to MFR 2 (190°C, 2.16 kg, ISO 1133), MFR 21 /MFR 2, in the range of from 22 to 50 and 0.1 to 3.0 wt% of a polyethylene wax, wherein components and add up to 100.0 wt%.