A polymer composition comprising: - from 15 to 60% in weight based on the total weight of of a component (a) consisting of glass fibers; - from 85 to 40% in weight based on the total weight of of a component (b) consisting of: - from 99.5 to 70% in weight based on the total weight of (b) of a polyaryl sulfone polymer (PAES) and - from 0.5 to 30 in weight based on the total weight of (b) of a polyarylene sulfide polymer having a weight average molecular weight from 30,000 to 70,000 g/mol as measured via GPC; - from 0 to 10% in weight based on the total weight of of at least one additive, wherein: at least 50 mol% of recurring unit of the PAES (R PAES) are represented by the following formula: where (i) each R k, equal to or different from each other, is selected from hydrogen, a halogen, an alkyl, an alkenyl, an alkynyl, an aryl, an ether, a thioether, a carboxylic acid, an ester, an amide, an imide, an alkali or alkaline earth metal sulfonate, an alkyl sulfonate, an alkali or alkaline earth metal phosphonate, an alkyl phosphonate, an amine, and a quaternary ammonium; (ii) each R' and R", equal to or different from each other, is selected from hydrogen, a halogen, an alkyl, an alkenyl, an alkynyl, an aryl, an ether, a thioether, a carboxylic acid, an ester, an amide, an imide, an alkali or alkaline earth metal sulfonate, an alkyl sulfonate, an alkali or alkaline earth metal phosphonate, an alkyl phosphonate, an amine, and a quaternary ammonium; (iii) each k, equal to or different from each other, is an integer ranging from 0 to 4. - from 15 to 60% in weight based on the total weight of of a component (a) consisting of glass fibers; - from 85 to 40% in weight based on the total weight of of a component (b) consisting of: - from 99.5 to 70% in weight based on the total weight of (b) of a polyaryl sulfone polymer (PAES) and - from 0.5 to 30 in weight based on the total weight of (b) of a polyarylene sulfide polymer having a weight average molecular weight from 30,000 to 70,000 g/mol as measured via GPC; - from 99.5 to 70% in weight based on the total weight of (b) of a polyaryl sulfone polymer (PAES) and - from 0.5 to 30 in weight based on the total weight of (b) of a polyarylene sulfide polymer having a weight average molecular weight from 30,000 to 70,000 g/mol as measured via GPC; - from 0 to 10% in weight based on the total weight of of at least one additive, wherein: at least 50 mol% of recurring unit of the PAES (R PAES) are represented by the following formula: where (i) each R k, equal to or different from each other, is selected from hydrogen, a halogen, an alkyl, an alkenyl, an alkynyl, an aryl, an ether, a thioether, a carboxylic acid, an ester, an amide, an imide, an alkali or alkaline earth metal sulfonate, an alkyl sulfonate, an alkali or alkaline earth metal phosphonate, an alkyl phosphonate, an amine, and a quaternary ammonium; (ii) each R' and R", equal to or different from each other, is selected from hydrogen, a halogen, an alkyl, an alkenyl, an alkynyl, an aryl, an ether, a thioether, a carboxylic acid, an ester, an amide, an imide, an alkali or alkaline earth metal sulfonate, an alkyl sulfonate, an alkali or alkaline earth metal phosphonate, an alkyl phosphonate, an amine, and a quaternary ammonium; (iii) each k, equal to or different from each other, is an integer ranging from 0 to 4.