Gel does nothing except create a non-breathable barrier that builds up heat. Gel will only have a initial cool feel and then only get hotter. This will create discomfort during the night causing you to be hot, sweaty, uncomfortable, and interrupting your sleep cycle. Additionally, gel does not allow for airflow because it seals off the foam's pores.
Our temperature regulating coating, KulKote, still allows the foam to be breathable while creating an initial cooling effect and neutralizing the temperature while you sleep.
Gel is a marketing story, while KulKote actually works!