This - very windy - little pillow retain heat, unfortunately, not very long. Since I'm used to Kirschkernsäckcken actually much longer heat dissipation. Can not recommend these pillows.
Have the Kirschkernkissen put in the microwave to warm up (lt. Absolutely released manual). After not only 30 sec. The Kirschkernkissen began to smoke and almost burning. The pad was immediately quenched with water and thrown out! The microwave stink