Sientra’s anatomically shaped implants are available in classic (taller than wide), oval (wider than tall) and round base (equal height and width) and encompass low, moderate and high projections. The gel is composed of High-Strength Cohesive silicone (HSC+) specifically formulated for these implants placed behind breast tissue or under the chest muscle. After the implant has been placed, the incision is carefully closed. The cohesion of the gel and maintenance of the projection makes Sientra implants exhibit strength and softness in one implant.