In any construction, your build is only as strong as your weaker part. For mattresses that is certainly true as the whole mattress can sag from a single weaker layer.
Thankfully the Avocado mattress has no weaker link. You start from the durable cotton and wool cover then the 2-inch Dunlop latex then the 8-inch pocketed coil system and all are very sturdy.
This means that the mattress will last a long time if cared for since hybrids are delicate mattresses. For example, not using a mattress protector will cause dust mites to inhabit the pocked coil part of the mattress and shortly after causing the coil to rust, weaken and sag.
It is very important to protect your hybrid mattress; more so than a regular latex mattress to ensure its longevity.