The thermo-therapeutic gel mask offers you a hot or cold facial treatment at your fingertips. - Cold use: Place the mask in the refrigerator 2 or 3 hours before each use. Then place it on your face and enjoy this moment of freshness for at least 15 minutes of pure happiness! - Hot use: Place the mask in hot water at a maximum of 80°C for 4 to 6 minutes. Check that the temperature of the mask is not too high before placing it on your face. Enjoy 5 to 10 minutes of absolute relaxation.