Open coil or pocket springs, which are better?

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Choosing between an open coil and pocket spring mattress depends on your needs and preferences. Pocket springs conform well to body shape and offer better-targeted support. They also absorb movement, meaning that couples are less likely to disturb each other in bed. However, coil springs are more affordable and widely available.

Sprung mattresses remain popular despite the influx of foam mattresses. Two common types of spring systems used in mattresses are coil springs and pocket springs. Understanding the differences between the two will help you determine which is better for you.

open coil spring unit and pocket springs side by side

What’s the difference between open coils and pocket springs?

Most mattresses contain springs, which provide the core support. How these springs respond to pressure, distribute weight, and contour to your body depends on their construction.

Open coil springs

Open coil springs, also known as Bonnell springs, are commonly used in low to mid-end mattresses because they are inexpensive to manufacture.

Each spring is made from a single steel wire twisted into an hourglass shape. This design allows the springs to compress easily under pressure while remaining supportive. The springs are arranged in rows and connected by helical wires, forming the spring unit.

open coil spring unit inside mattress
An open coil spring unit

Pocket springs

Pocket springs are smaller, softer springs encased in fabric and stitched or hand-tied together. Each spring works independently, allowing the mattress to better adjust and conform to body shape. Pocket springs are more expensive to manufacture and are often used in higher-quality mattresses.

pocket springs in rows
Rows of pocket springs

How do open coil and pocket spring mattresses compare?

Open coil and pocket spring mattresses have unique properties, each offering different levels of support, comfort, and responsiveness.

Comfort

Open coil and pocket spring mattresses have different comfort layers to help cushion the body and relieve pressure. These comfort layers vary in thickness and are made from materials chosen for their comfort, durability, and ability to absorb moisture.

Open coil mattresses typically have thinner comfort layers made from synthetic materials like polyester, foam, and fibre pads to ensure they remain affordable. These comfort layers may not provide enough cushioning for heavier body parts like the shoulders and hips, resulting in discomfort or painful pressure points. Heavier individuals might even feel the base underneath the mattress, a sensation known as ‘bottoming-out’.

Higher-quality pocket spring mattresses contain premium materials like latex, wool, silk, and horsehair. These materials provide a softer, more luxurious feel and are durable and breathable. They offer generous cushioning, making them ideal for side sleepers.

Support

Sprung mattresses offer different levels of support depending on factors like spring count, wire thickness (gauge), construction quality, spring height and shape.

In general, the more springs there are in a mattress, the more support it will provide. Open coil mattresses usually contain between 300 and 800 springs. Pocket spring mattresses can have significantly more springs, with models containing more than 2,000 made up of multiple layers of springs.

Open coil mattresses have a firmer, bouncier feel. Since the springs are interconnected, weight is evenly distributed across the mattress. However, since coil springs work as a unit, they are less effective at body-conforming. When pressure is applied to a specific area, the surrounding springs also compress, reducing their ability to adapt to the body.

Pocket springs work independently. They are highly responsive and conform better to body shape. Pocket spring mattresses often come in different firmness levels, including soft, medium, firm, and extra firm, to suit sleepers with different body weights and preferences. Split tension mattresses are also available, allowing couples to choose different firmness levels for each side of the bed.

Many pocket spring mattresses can also be paired with a matching pocket spring divan base to improve comfort and support.

Edge support

Edge support keeps the mattress’s perimeter sturdy and supportive. It extends the usable sleeping area and allows you to sleep closer to the edge without worrying about falling out of bed. Edge support is particularly beneficial for sleeping partners or those who struggle to get in and out of bed.

Coil spring mattresses often have weak edges that can sag or collapse under pressure. In contrast, some higher-quality pocket spring mattresses are hand-side stitched. This labour-intensive technique secures the side panels to the outer springs to improve support and prevent the edges from sagging.

However, some mattresses have machine-stitched edges, which are mostly cosmetic and common in cheaper models. These edges are more likely to sag or collapse under weight.

Partner disturbance

Partner disturbance is one of the main reasons for poor quality sleep, so choosing a mattress that minimises movement is essential.

Open coil mattresses have a bouncier feel and transfer movement across the entire sleeping surface, making it more likely for couples to disturb each other when moving in bed.

Pocket springs are more effective at absorbing movement and are ideal for couples. They work independently, so when pressure is applied to a specific area, the other springs are unaffected.

Durability

Open coil mattresses are mass-produced and predominantly machine-made. They are often constructed to meet a specific price point to appeal to a broader market. They usually have thinner synthetic comfort layers that can wear out quickly. Furthermore, as the springs are interconnected, a broken spring can affect the entire support system.

Pocket spring mattresses are typically constructed to higher standards, with higher-quality models often handcrafted. They usually contain natural materials that retain their shape longer. Since pocket springs work independently, a broken spring does not compromise comfort or support.

A good quality pocket spring mattress can last up to 20 years with proper care, while an open coil mattress typically lasts 6 to 8 years.

Affordability

Open coil mattresses are cheaper to manufacture and often more affordable than pocket springs, making them a good option for shoppers on a budget. They are ideal for children, teenagers, or guest rooms. However, they tend to wear out faster and may need replacing more often, potentially costing more in the long run.

Customisation 

Open coil mattresses are mass-produced and usually only available in standard sizes with limited options. Pocket spring mattresses are more customisable, allowing you to choose from different firmness levels, coverings, or even bespoke sizes.

Final thoughts

Pocket springs are superior to coil springs. They are typically more comfortable, supportive, and durable. However, coil springs are more affordable and widely available, making them a good option for children, teenagers, or guest bedrooms.

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About the author

Tony Brown is the founder and creator of The Bed Consultant. His career in the bed industry began in 2002. After graduating from university with a degree in Business Administration, Tony joined one of the largest independent furniture retailers in the UK as a bed consultant. Tony has helped thousands of customers find the perfect mattress.

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