Both silicone gel and saline implants are safe, work well and can look totally natural. It really is a matter of understanding the performance differences between the two types of implants, figuring out what your priorities are, and deciding what it best for you personally.Saline breast implants are inserted uninflated and are filled with sterile saline (salt water) from a bag of IV fluid - the same fluid that is administered intravenously to patients during surgery. As they are inserted unfilled, they can be introduced through an incision that is slightly smaller than what is required for silicone gel implants. Their fill volume can be varied - for example a 300cc implant can be inflated to any volume between 300 and 330cc - so minor asymmetries in breast volume can often be 'fine tuned' by varying the fill volume of the implants.The silicone gel implants that were approved by the FDA in 2006 for general cosmetic use are cohesive silicone gel implants, a term which means that the gel material inside the implants is in a solid state. This solid gel material feels somewhat firmer than the old liquid silicone gel implants, but has the distinct advantage of not leaking out of the implant if and when the outer shell fails. Gel implants are packaged pre-filled, and come in sizes that vary in fill volume by about 25-30cc.In most patients, silicone gel implants are difficult to discern as separate from breast tissue when feeling for them with your fingertips. They feel soft, natural, and the shell of the implant is usually palpable only in very slender patients with small breast volumes preoperatively (A, small B). In most of these cases the implants are palpable only in the most lateral aspect of the augmented breast, where there is the least amount of natural tissue concealing them. In many patients with cohesive silicone gel implants it is essentially impossible to detect the presence of the implants by feel. It is not uncommon for a patient with cohesive gel implants to report at their six- or twelve-month follow-up appointment that they tend to forget that they have breast implants, as the look and feel of their augmented breasts is so natural.Saline implants are soft, but because the fill material is non-viscous (salt water) the outer margins of the implant are less well-supported. The outer shell of the implant therefore tends to collapse at the edges of the implant, making the outer shell material more easily palpable as 'ridges' or folds. This is most significant in patients with the least amount of natural tissue to conceal the implants: slender women with A-cup and small to medium B-cup breasts. On the other hand, fuller-figured patients with full B-cup breasts who are seeking a C- or D-cup breast enhancement often get a result with saline implants that feels completely natural.So silicone gel implants provide a palpability advantage for slender, small-breasted women. For fuller-figured women with a fuller preoperative breast volume, there is less of a palpability difference between saline and silicone gel implants.