I have 2 Tempur Sonata in Gr. S and M ordered. When ordering, I was convinced that we have found the perfect pillow - because of clever shape, but also because of the innovative material. The first time you try it after unpacking it felt quite comfortable on - the curve flatters perfectly the neck and in the supine position can no longer bend the head, which is known to the next morning's quite painful. I have tried it so during the day - the following two nights were hell !!!! It felt as if you were lying on a sandbag - the pillows were hard as a board - nothing more snuggle with! The answer (and the only reason I am writing this review): Although the material reacts to body heat - but only up to a certain room temperature. At current autumn night temperatures 8-12 ° C it forms no longer - the pillow is because as a board, the body heat reaches only to about 18 ° C ambient temperature (search Internet). The pillows so wonderful they may be, so are definiv nothing for notorious "In-open window sleeper" like me / us. Or one would have to take to the cool / cold season again normal pillow - but getting used would certainly be difficult ... Anyway, I'm glad I did not have my test nights with Tempur-pillows in midsummer - we would namely keep the pillows definitely and the disappointment would now huge!
