Thank you for your question.
Whilst we have no direct comparison for the Mammoth range we would say that they come in similar to our Hybrid and Latex ranges.
Our Hybrid range provides a similar sink in sensation to Memory Foam but it doesn’t rely on heat in order to adapt to body movements.
Our Fusion range is different in the sense that it feels firmer overall but still has that sink in sensation.
At the body weight provided I would guide you to our Hybrid 4 model, which will feel more medium overall.
In our Fusion range I would guide you to our Fusion 3 model as this comes with a Latex topper to soften down the feel meaning again it will come in feeling medium overall.
With those existing pains you don’t want anything that is too firm or too soft in the feel as you want something supportive but not too firm.
I hope that this has answered your questions fully but if you do have any further queries then please don’t hesitate to contact me on 0161 437 4419.
Kind Regards, Lee.