Wherein the core part polymer is a thermoplastic polymer, and the core part polymer is a polyamide having a dicarboxylic acid unit as a main component, the boiling water shrinkage is 6.0 to 12.0%, the tensile strength of the fiber is 3% Wherein the core has a stress of not less than 0.60 cN / dtex. Provided is a core-sheath composite cross-section fiber which is excellent in moisture absorption performance and wrinkle prevention property and which retains hygroscopic performance even when washed.
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