To obtain a material and a product, produced with excellent process stability in a fiber-forming step and an after-processing step, providing little light and shade color difference by the thick and thin difference and thereby providing a natural mottled pattern when being dyed, providing a light feeling, a spring back feeling and a dried and powdery touch feeling by the hollow fiber structure and ruggedness imparted to the surface of a fabric, and having good color fastness to dyeing.

This hollow multifilament constituted of hollow single fibers having changes of cross section areas in fiber axis directions has 2-20% Uster irregularity in the longitudinal direction by a normal test, different cross section areas among single fibers in the cross sectional direction, ≥1.2 maximum value of thick and thin ratio in the cross sectional direction, and ≤0.26 cN/dtex standard deviation of the stresses at 40% elongation in strength and elongation curves measured by 5 cm sample.