In the case of Cell Solution® CLIMA products this is a paraffin that melts in a temperature range between 28-35°C.
Paraffin has the capability to latently accumulate energy when it is liquid. That means that at the time of phase change from solid to liquid state there will be no further heating of the paraffin and thus of the environment for a defined time.
Fiber composition in mass percent in temperature-controlled condition
Textile - physical fiber characteristics
Dyeability in all colors
Phase change temperature at heat absorption: 28-35°C