Pellon SK135 Sheer-Knit Fusible Interfacing 20″ x 10 yards Bolt. Color: Black. Fiber Content: 100% Polyester. Application Method: Fusible. Sheer-Knit interfacing is a soft sheer fusible tricot interfacing used both for underlining and supple stabilization and support. It is great for use in soft blouses and lingerie, and ideal for sheer to lightweight fabrics.