Fusible interfacing is the extra layer that will give your finished garment shape and support in detail areas. It is necessary for putting the finishing touches on collars, cuffs, lapels and necklines, pockets, waistbands and it will aid in keeping your garment crisp through repeated washings and wearings. This light weight fusible interfacing has a resin coating on the back that fuses to the fabric when steam, heat, and pressure are applied.