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Bonnell Spring vs. Polyurethane Foam

Bonnell Spring

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.

Polyurethane Foam

Polyurethane foam is a blanket term that includes any foam that is synthesized using polyol and diisocyanate. These include but are not limited to: memory foam, high resilience foam, and high density foam. Since polyurethane foam can contain additives, a manufacturer that comes up with a new formula can name the new foam whatever they like.

Many memory foam mattresses are a combination of polyurethane foams, layered from dense on the bottom to less dense on the surface layers.

Polyurethane is a synthetic blend of organic compounds 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: Many different types of foams exist under the polyurethane umbrella -- some are excellent for bedding and offer different firmness varieties!

Cons: Off-gassing and durability problems with lower quality foams.

Learn More About Bonnell Spring

Learn More About Polyurethane Foam

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Material Scores

Overall Score:
Bonnell Spring: 8.7/10
Polyurethane Foam: 9.4/10

Bonnell Spring: 8.7/10
Polyurethane Foam: 9.4/10

Bonnell Spring: 8.4/10
Polyurethane Foam: 9.5/10

Bonnell Spring: 9.5/10
Polyurethane Foam: 8/10

Bonnell Spring: 9.4/10
Polyurethane Foam: 8.1/10

No Odor:
Bonnell Spring: 9.4/10
Polyurethane Foam: 8.4/10

General Support:
Bonnell Spring: 8.9/10
Polyurethane Foam: 9.5/10

Bonnell Spring: 8.7/10
Polyurethane Foam: 8.5/10

Price Value:
Bonnell Spring: 8.4/10
Polyurethane Foam: 9.5/10