Whisper Weft is a weft-insertion, fusible knit interfacing. It is made of 60% polyester/40% rayon. Whisper Weft combines the stability of a woven interfacing with the drapeability of a knit. This lightweight interfacing is soft and supple and made for tailoring applications such as collars and lapel shaping on light- to medium-weight fabrics. Fusible, lightweight, weft-insertion interfacing for soft tailoring.