after receipt of my order and compliant product. FYI, amazed at the price of this topper I contacted the seller beforehand to see what it was. The answers were clear and simple without fuss, a shape memory mattress topper like those we see in the big house without signs and 4 cm. well it's true! for what is the topper, I think after the first night: I find that it keeps you warm and I slept rather badly (it's a bit against the grain of what is said but ... ) I am a little time to get used to because I find my most comfortable bed, more welcoming when I moved myself to do ... to use. In any case to have really taken the time to go and shop after searching on net this kind of product, it is clear that some have to make sacred margins ... amazing! You understood I highly recommend because Evazen invest between 79 euros and 250 bcp to see the same thing there's no picture!