A breathable film comprising at least one biodegradable polymer and from 35 to 65 wt.-%, based on the total weight of the breathable film, of a surface-treated filler material product, wherein the surface-treated filler material product comprises A) at least one ground calcium carbonate-comprising filler material having - a weight median particle size d 50 in the range from 0.1 μm to 7 μm, as determined by using the method defined in the description, - a top cut particle size d 98 of ≤ 15 μm, as determined by using the method defined in the description, - a specific surface area from 0.5 to 150 m 2 /g, as measured using nitrogen and the BET method according to ISO 9277, and - a residual total moisture content, as determined according to the method in the description, in the range from 0.05 to 0.3 wt.-%, based on the total dry weight of the at least one ground calcium carbonate-comprising filler material B) a treatment layer on the surface of the at least one ground calcium carbonate-comprising filler material comprising i. at least one mono-substituted succinic anhydride consisting of succinic anhydride mono-substituted with a group selected from a linear, branched, aliphatic and cyclic group having a total amount of carbon atoms from at least C2 to C30 in the substituent and/or salts thereof, and/or ii. at least one saturated or unsaturated aliphatic linear or branched carboxylic acid and/or salts thereof, preferably at least one aliphatic carboxylic acid having a total amount of carbon atoms from C4 to C24 and/or a salt thereof, wherein the surface-treated filler material product comprises the treatment layer in an amount of from 0.1 to 3 wt.-%, based on the total dry weight of the at least one ground calcium carbonate-comprising filler material, and wherein the at least one biodegradable polymer has a tensile E-modulus, measured according to ISO 527-3, of below 2 100 MPa and wherein the at least one biodegradable polymer is biodegradable in the sense of ISO 13432. A) at least one ground calcium carbonate-comprising filler material having - a weight median particle size d 50 in the range from 0.1 μm to 7 μm, as determined by using the method defined in the description, - a top cut particle size d 98 of ≤ 15 μm, as determined by using the method defined in the description, - a specific surface area from 0.5 to 150 m 2 /g, as measured using nitrogen and the BET method according to ISO 9277, and - a residual total moisture content, as determined according to the method in the description, in the range from 0.05 to 0.3 wt.-%, based on the total dry weight of the at least one ground calcium carbonate-comprising filler material - a weight median particle size d 50 in the range from 0.1 μm to 7 μm, as determined by using the method defined in the description, - a top cut particle size d 98 of ≤ 15 μm, as determined by using the method defined in the description, - a specific surface area from 0.5 to 150 m 2 /g, as measured using nitrogen and the BET method according to ISO 9277, and - a residual total moisture content, as determined according to the method in the description, in the range from 0.05 to 0.3 wt.-%, based on the total dry weight of the at least one ground calcium carbonate-comprising filler material B) a treatment layer on the surface of the at least one ground calcium carbonate-comprising filler material comprising i. at least one mono-substituted succinic anhydride consisting of succinic anhydride mono-substituted with a group selected from a linear, branched, aliphatic and cyclic group having a total amount of carbon atoms from at least C2 to C30 in the substituent and/or salts thereof, and/or ii. at least one saturated or unsaturated aliphatic linear or branched carboxylic acid and/or salts thereof, preferably at least one aliphatic carboxylic acid having a total amount of carbon atoms from C4 to C24 and/or a salt thereof, i. at least one mono-substituted succinic anhydride consisting of succinic anhydride mono-substituted with a group selected from a linear, branched, aliphatic and cyclic group having a total amount of carbon atoms from at least C2 to C30 in the substituent and/or salts thereof, and/or ii. at least one saturated or unsaturated aliphatic linear or branched carboxylic acid and/or salts thereof, preferably at least one aliphatic carboxylic acid having a total amount of carbon atoms from C4 to C24 and/or a salt thereof, wherein the surface-treated filler material product comprises the treatment layer in an amount of from 0.1 to 3 wt.-%, based on the total dry weight of the at least one ground calcium carbonate-comprising filler material, and wherein the at least one biodegradable polymer has a tensile E-modulus, measured according to ISO 527-3, of below 2 100 MPa and wherein the at least one biodegradable polymer is biodegradable in the sense of ISO 13432.