The hi-tech swimsuits that have led to a deluge of world records will be banned from January when the sport will revert to costumes made from textiles.
Swimming's governing body FINA says material can only be textile fabric with men's constumes not extending above the navel or below the knee.
For women costumes shall not extend above the neck, beyond the shoulders or below the knee.
FINA says a scientific committee will be appointed to define textile fabric for its regulations by the end of September after its executive discussed how to implement the decision made at a congress last week to dump the latest suits.
Controversy over all-polyurethane suits has overshadowed the world championships in Rome, where the rapid rate at which records are falling has heightened fears for the sport's credibility.