Coolsculpting only melts fat cells and it does it in slow and noninvasive manner. One treatment melts 25 % of fat cells. After coolsculpting treatment your fat is gone, but the sagging skin is still present and that is treated with laser treatment, ultra sound and radio frequency. It tightens the skin and improves overall appearance of the treated area. In short, it tightens the skin after the stubborn fat is removed. Good luck!
Laser treatments are recommended as a good pair with CoolSculpting to help tighten the skin after the fat has been removed. I encourage you to schedule a consultation with a board certified plastic surgeon to discuss the right treatment plan for your particular case.