Hi yserius,
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From what I can see it is 2" of 100% natural Dunlop latex over a middle 1.5" core of firmer rubberized coir.
I can only speak to the quality or value of a mattress (see mattress firmness/comfort levels in post #2 here) and in your case I have no idea of pricing for Europe so I can only really speak to the quality of the materials and both the latex and the rubberized coir are good quality materials and there are no obvious weak links in the mattress in terms of durability. The cover also uses high quality and breathable materials (cotton and wool).
They don’t have any information about the softness/firmness of the latex so even “theory” wouldn’t be any help and your own personal testing and experience would really be the only way to know how suitable it was in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences). Since you are about 250 lbs which is a heavier weight range you may need layers that are firmer than average and a little more thickness may also be more adaptive to different sleeping positions and provide better pressure relief but if you aren’t able to test it in person then a more detailed phone conversation with the manufacturer is the next best way to help you assess whether it may be suitable for your body type, sleeping positions, and preferences based on the “averages” of any of their customers that may be similar to you in combination with any information you can provide them with similar mattresses you have tested in person.
Phoenix