The reason for this is because if you re heavier you will put more pressure on your mattress and it will feel soft to you.
Firm mattress or medium firm.
The medium firm mattress is a universal model found in most hotels featuring even levels of body contouring and push back or hug without feeling too soft or too hard.
A firm mattress typically rates between 8 and 10 on the firmness scale.
And the optimal support a medium firm mattress gives is for people who weight between 64 and 101 kg 10 16 stone.
These beds are soft to the touch respond quickly to pressure and are less likely to have excessive sinking than a soft bed.
While a firm mattress typically falls around an 8 on a scale of 1 10 a medium firm mattress is generally in the 5 7 range giving it a slightly softer more cushiony feel.
A medium mattress is a 5 on the firmness scale.
In other words a medium firm mattress is medium firm when averaging its various layers.
These beds have less give and offer a more stable even sleeping surface with very little sinking.
The closer you get to the higher end of the weight spectrum the more likely it becomes that you ll prefer the firmer of the two.