Innerspring Mattress

Different Types of Mattress Coils

What are the different types of coils used in mattresses?

So, what do you consider when shopping for a mattress? Well, comfort, durability, and price are important, as are bounciness and the likelihood of sagging. All of these characteristics are directly related to the kind of coil used inside of a mattress. Read on below as we discuss the four most common coils used in mattresses today.

Continuous Coils

It is also known as the Mira design. This design consists of a single strand of wire that runs the length of the mattress. The wire is coiled into springs. As a result, the springs tend to support each other and provide stability. This also makes the mattress more durable. However, this design does not let the mattress conform to the contours of your body, thus compromising on comfort. Furthermore, it can be noisy as the springs rub against each other. The price of this mattress ranges from low to medium, and it is fairly popular with buyers.

Bonnell Coils

This type of mattress is also known as the Bonnell coil. It is a firm and also fairly popular. This mattress is made of a wire frame within which multiple coil springs are placed. This design has fairly good durability. The coil springs are made in an hourglass shape that works together to be extremely resistant to increased loads, creating long-lasting support and firm comfort. However, it only has average motion isolation, which means that the movements of your partner could interfere with your sleep. The pricing for the open coil is fairly low. On the flip side, the mattresses are prone to sagging over time. This can be countered by flipping the mattress onto the other side for even wear.

Offset LFK Coils

Open-offset LFK (Left Facing Knot) coils are ergonomically designed to offer ultra-responsive support. The LFK coil structure enhances body support, where each coil is resilient and works together to create an overall and effective response to greater load. They are similar to open coils with the main difference being the fact that each coil spring is connected to the next by a helical wire that runs at the top. This design provides for fair body contouring together with improved motion isolation. This mattress design is supportive of the body.

Pocketed Coils

This design is so named because of the fact that each coil is individually wrapped in its own pocket. As a result, each spring moves independently of the others, making for good motion isolation. Furthermore, the individual springs are better able to adjust to the body’s weight and contours. This reduces pressure points, thus making for a higher degree of comfort. It is the most expensive of the innerspring mattresses.

What is a Mattress Coil Gauge?

A mattress coil spring is designed to be compressed when pressure is applied to it and to regain its former position when the pressure eases off. The ability to resist pressure is what gives it its bounce. Obviously, the thickness of the coil spring will determine how much it will compress. This, in turn, will determine the relative comfort of the mattress. Thickness or diameter is referred to as gauge and ranges from 12 to 15 with the higher number being thinner.

Note that thinner coil springs will make the mattress softer to lie on while the thicker gauges give it firmness. It, therefore, means that heavier people should go for the lower gauge coil springs because of their load bearing strength. The opposite is likely to be true for lighter people. Another issue worth considering is that thicker springs are also more durable and will increase the lifespan of your mattress.

What is Mattress Coil Count?

The number of coil springs inside your mattress. The lowest number should be 300 in any size mattress. Queen size mattresses have a coil spring count density range of 450-900 with 725 being average. A top quality king size mattress could go as high as 2,000 springs. Most of the springs are made of tempered steel. The overall cost of a mattress is closely associated with the number of coils inside the mattress.

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