The present invention relates to macrocyclic compounds of Formula (I)wherein Ar1, Ar2, R1, R2, R3, R4, and X are as described in the description, their preparation, to pharmaceutically acceptable salts thereof, and to their use as pharmaceuticals, to pharmaceutical compositions containing one or more compounds of Formula (I), to their use as modulators of CFTR alone or in combination with one or more therapeutically active ingredients acting as CFTR potentiators or CFTR correctors.