Breast Implants are a procedure to increase the size of one's breasts. It is commonly done for females, but there are also male breast implants. You have two options when considering breast implants, Saline and Silicone. According to WebMD: Saline-filled implants are silicone shells filled with sterile salt water (saline). Silicone-filled implants are silicone shells filled with a plastic gel (silicone). Although many women say that silicone implants feel more like real breasts than saline, they pose more of a risk if they leak.