Silhouette soft uses sutures made from Poly L-lactic acid (PLLA), a material that has been used for many years in different specialities of surgery and pharmaceutical applications. These sutures are places under the skin to lift and hold the contours of the face in place. The body then produces more collagen as a natural reaction to a foreign body being placed in it. The dual action of the sutures and the collagen reshape and smooth the face, making it tighter and younger-looking.