The height of our silk pillows is approximately 9-10cm(3.5”) and 6-7cm(2.4“) when pressed upon. The pillows will gradually become more compressed over time due to constant pressure, but this process is very slow with our silk pillowcases and could take 5-10 years before you start to notice any serious change of shape. We have developed new Washable Cotton Covered Silk Lined Pillow and you have 2 height options to choose from, according to your demands: Soft-5“(13 cm), Firm-6”(16 cm).