Hi Jewels,
The PLB Vitality Hybrid has the following specs …
2" Talalay GL fast response 15 ILD
2" Blended Talalay 24 ILD
7" Bonded polyfoam/latex support core (see post #6 here).
The density of Talalay latex isn’t important to know since density is a “comfort spec” with latex … not a “quality spec”.
All of these are high quality materials and there would be no weak link in the mattress in terms of durability. Although the firmness/softness of the materials would also be a factor in durability and softer foams will be less durable than firmer foams … you are not in a weight range where this should be an issue. There is more about the variables that can affect durability and the useful life of a mattress in post #4 here and the posts it links to.
There are too many unknowns, variables, and personal preferences involved for someone else to be able to predict whether any mattress would be a good match for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) by using a formula, specs (either yours or a mattress) or “theory at a distance” (see mattress firmness/comfort levels in post #2 here). Your own careful and objective testing using the testing guidelines would be the most reliable way to know whether any mattress is a good match for you because only you can feel what you feel on a mattress.
Phoenix