Profile is to do with the width and how far it protrudes/projects from your chest wall, it makes no difference in size. You have what is called a BWD, Base Width Diamiter, it is the width of your chest, if you have a very narrow chest you will need a high/xhp implant to allow it to fit, the same goes for using a very large size implant, for example I have 615, there’s not enough room in the sides of the breast to hold that volume so the cc needs to be pushed forward/off my chest wall to allow it to fit. Theres a pic on my blog here that will help explain : http://noobiestoboobies.blogspot.ie/2013/10/breast-implant-catalouges-sizing-info.html
hope this helps x