a linear block copolymer of regular structure , comprising polyamide and polyethylene glycol blocks . two polyamide blocks are bound through an intermediate polyethylene glycol block according to a structural scheme . fibers exhibiting a high moisture absorption strong mechanical properties and a high dyeability . textile manufactured goods comprising said fibers . a process to obtain said block copolymer , through the preparation of a polyamide and a polyethylene glycol , and condensation of polyamide and polyethylene glycol so as to obtain a structure .