Hi cherly… 
im having extra high profile implants and this is because i have a narrow chest frame i measure 30 inches. im not sure that they sit higher but they give u more projection than low profiles hun i copied this off a website 4 u, hope it helps luv…
Using a high profile implant, a patient can get the larger implant she desires with an implant that will not be too wide for her narrow frame. High Profile Implants
These breast implants have more projection per measurement of base diameter than a moderate profile breast implant. An added benefit of the high profile breast augmentation is that in order to create the profile, the side wall of the implant has more height, which may reduce visible rippling. These high profile breast implants will provide more anterior projection (front projection)