A hybrid mattress blends foam and pocket springs in one mattress. Usually this involves a more substantial foam layer than other mattresses that are marketed as innerspring.
A hybrid mattress offers a 'best of both worlds' type feel, where there is added support from the pocket coils and a comfortable, pressure point relieving surface.
Though there are latex and memory foam hybrids, the feel of them can be quite different because of the response of the latex vs the memory foam's slow response.
Pros: Best of both worlds with memory foam / latex and pocket coils provide ultimate comfort and support.
Cons: Beware of the foams being used as some hybrids still off-gas or sag because of lower quality materials.
Innerspring systems describe mattresses made with coil systems. Traditional innerspring mattresses were made with interconnected coils, providing structure to the bed. In recent years, some have used 'innerspring' to describe newer pocket spring systems that are independent and offer greater comfort.
In general, most use 'innerspring' to describe the traditional mattress styles and those that purchased a mattress in the 20th century are very used to these types of beds.
The interconnected spring systems offer a high amount of durability and support, but there are complaints of aggravated pressure points and discomfort despite comfort layers of foams on the surface.
Pros: Durable materials and traditional even feel.
Cons: Pressure point discomfort and motion transfer issues.