A multi-layered polymer film, comprising a sealing layer and a base layer, wherein the sealing layer comprises a polypropylene, and wherein the sealing layer polypropylene SL-PP - comprises comonomer units derived from ethylene in an amount of from 0.5 wt% to 25 wt%, and from at least one C 5-12 alpha-olefin in an amount of from 0.5 mol% to 4.0 mol%, - has an amount of xylene solubles XS of at least 20 wt% as determined at 25 °C according to ISO 16152, first edition; 2005-07-01, and the xylene solubles have an amount of ethylene-derived comonomer units of from 4 wt% to 50 wt%, - complies with the following relation: C 2 XS × XS/100 / C 2 total ≥ 0.90 wherein C 2 is the amount in wt% of the ethylene-derived comonomer units in the xylene solubles of the sealing layer polypropylene, XS is the amount in wt% of xylene solubles of the sealing layer polypropylene, C 2 (total) is the amount in wt% of the ethylene-derived comonomer units in the sealing layer polypropylene, and - complies with the following relation: C 5 − 12 XS × XS/100 / C 5 − 12 total ≤ 0.30 wherein C 5-12 is the amount in wt% of the C 5-12 alpha-olefin-derived comonomer units in the xylene solubles of the sealing layer polypropylene, XS is the amount in wt% of xylene solubles of the sealing layer polypropylene, C 5-12 (total) is the amount in wt% of the C 5-12 alpha-olefin-derived comonomer units in the sealing layer polypropylene. - comprises comonomer units derived from ethylene in an amount of from 0.5 wt% to 25 wt%, and from at least one C 5-12 alpha-olefin in an amount of from 0.5 mol% to 4.0 mol%, - has an amount of xylene solubles XS of at least 20 wt% as determined at 25 °C according to ISO 16152, first edition; 2005-07-01, and the xylene solubles have an amount of ethylene-derived comonomer units of from 4 wt% to 50 wt%, - complies with the following relation: C 2 XS × XS/100 / C 2 total ≥ 0.90 wherein C 2 is the amount in wt% of the ethylene-derived comonomer units in the xylene solubles of the sealing layer polypropylene, XS is the amount in wt% of xylene solubles of the sealing layer polypropylene, C 2 (total) is the amount in wt% of the ethylene-derived comonomer units in the sealing layer polypropylene, and C 2 is the amount in wt% of the ethylene-derived comonomer units in the xylene solubles of the sealing layer polypropylene, XS is the amount in wt% of xylene solubles of the sealing layer polypropylene, C 2 (total) is the amount in wt% of the ethylene-derived comonomer units in the sealing layer polypropylene, and - complies with the following relation: C 5 − 12 XS × XS/100 / C 5 − 12 total ≤ 0.30 wherein C 5-12 is the amount in wt% of the C 5-12 alpha-olefin-derived comonomer units in the xylene solubles of the sealing layer polypropylene, XS is the amount in wt% of xylene solubles of the sealing layer polypropylene, C 5-12 (total) is the amount in wt% of the C 5-12 alpha-olefin-derived comonomer units in the sealing layer polypropylene. C 5-12 is the amount in wt% of the C 5-12 alpha-olefin-derived comonomer units in the xylene solubles of the sealing layer polypropylene, XS is the amount in wt% of xylene solubles of the sealing layer polypropylene, C 5-12 (total) is the amount in wt% of the C 5-12 alpha-olefin-derived comonomer units in the sealing layer polypropylene.