Bonnell spring mattress systems are the most traditional type of innerspring mattress. The Bonnell coil has an hour glass shape (wider at the bottom and the top than the middle) and are interconnected with a mesh of metal to make the spring system.
In many traditional innerspring mattresses from the 20th century and still some entry level models today have used the Bonnell spring to create durable and supportive mattresses.
Though this system is good at providing even support, there are complaints of aggravated pressure points and discomfort with Bonnel spring systems.
Pros: Durable materials and traditional even feel.
Cons: Pressure point discomfort and motion transfer issues.
High density foam is a very firm foam that generally makes up the bottom layer of popular memory foam mattresses. Other types of mattresses such as innerspring or hybrid may also use high density foam to support the spring systems.
High density foams generally are not used to create the entire mattress because they are just too firm. So, generally they are used as a foundation for the bed or to provide edge support.
High density foam is made of a blend of polyurethane and has a tendency to off-gas. If you are susceptible to lung issues, please do additional research on the quality of foams before purchasing.
Pros: Structural firm foam used by many mattresses to provide foundation and shape.
Cons: Off-gassing problems with lower quality foams and it is too firm to make a mattress in its entirety.
Overall Score:
Bonnell Spring: 8.7/10
High Density Foam: 8.9/10
Comfort:
Bonnell Spring: 8.7/10
High Density Foam: 8/10
Softness:
Bonnell Spring: 8.4/10
High Density Foam: 7.5/10
Cooling:
Bonnell Spring: 9.5/10
High Density Foam: 8/10
Hypoallergenic:
Bonnell Spring: 9.5/10
High Density Foam: 8/10
Odor:
Bonnell Spring: 9.5/10
High Density Foam: 8/10
General Support:
Bonnell Spring: 8.9/10
High Density Foam: 9.3/10
Eco-Conscious:
Bonnell Spring: 9.5/10
High Density Foam: 8/10
Price Value:
Bonnell Spring: 8.4/10
High Density Foam: 9.4/10
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