FDY is mainly used as weft or weaves in making fabrics. FDY can be knitted or woven with any other filament yarn to get fabric of various different varieties. Fully Drawn Yarn. Fully Drawn Yarn (FDY) is produced by a process similiar to POY manufacturing except that the yarn is produced at higher spinning speeds coupled with intermediate drawing integrated in the process itself. This allows stabilisation through orientation and crystallization.