Although both silicone and saline implants have an outer silicone shell, the material inside the implant and their consistency is what differentiates the two.
Saline implants are filled with sterile salt water. During surgery, the implant is inserted empty and then filled after it’s positioned.
Silicone implants come pre-filled with a silicone gel. This gel is a sticky, thick fluid designed to feel like human fat. Many women report that silicone implants look and feel more like natural breast tissue, but there are pros and cons to both types of implants.
Also, saline implants are available for women 18 and over, whereas silicone implants are available for women 22 years of age and older.