Hi Dimitrios,

As detailed in the description of this product, the 18cm core is made of 16cm 100% natural latex of 70kg density with 1cm each side of graphite latex to provide fire retardance. The topper is 5cm of 100% natural, 70kg density latex. Latex should respond in the same way for your body weight whether in single or double size. We do not use either Dunlop or Talalay latex in any of our fusion range.

Kind regards