Hi David

Thanks for your question. The Fusion 4 and Fusion 5 products have totally different feels. Please see our information on Latex mattresses.

The Fusion 5 is a solid core medium density Latex mattress. The Fusion 4 has the solid core firm density feel with the medium feel latex topper.

At your current body weights you are more in line with a medium density feel mattress, please have a look at the following article on mattress tensions here.

The Fusion 5 or Fusion 3 are the 2 models to have a look at in our range, the Fusion 3 has the same medium density solid latex core, but also has the added 5cm deep medium density latex topper, which gives the overall medium feel a softer edge.

If you require any further assistance, please call the office on 0161 437 4419

Regards Julie