Cryo Slimming - 3 Pack 28 Minute Session. Cryoskin is a non-invasive treatment used for slimming, cellulite reduction, and toning. The session lasts for 28 minutes and is done manually through a massage technique. The session begins with heat and then a decrease in temperature to -8° for the duration of the session. The first results are generally visible from the first session and often very encouraging. However, it should be noted that the best results appear from 15 days to 3 weeks after the first session and extend for several months afterward.