All implants can sag. It is more of a weight issue and the quality of the tissues as opposed to the type of implant.
The most important factors to avoid sagging of breast implants are:The skill of your plastic surgeonPlacing the breast implant underneath the chest muscleProper postoperative care.Plastic Surgeons Feel That Textured Breast Implants Are Less Likely to Drop However Even Textured Implants Placed Incorrectly Can Bottom out.