Foam vs Spring Mattress

Key Takeaways

1. Spring mattresses keep you sleeping on top of the bed with bounce while memory foam lets you sink in with body-hugging comfort.
2. Match your mattress firmness to your sleep position for proper spinal alignment and pressure relief.
3. Foam mattresses deliver superior pressure relief and motion isolation at the cost of sleeping warmer.
4. Spring mattresses sleep cooler and have stronger edges but struggle with pressure distribution and motion transfer.
5. Pick spring if you sleep hot, foam if you have joint pain, or hybrid if you want both benefits in one bed.

Buying a new mattress is one of the most important investments you can make for your daily comfort, health, and overall well-being. With one-third of your life spent sleeping, the surface you rest on directly affects your spinal alignment, joint health, and energy levels. If you are comparing your options, you will quickly find that the market is dominated by two primary categories.

You have likely asked yourself: What’s the difference between a memory foam vs spring mattress? Which one offers the best support? Which one will keep you cool?

This guide breaks down everything you need to know about these two popular materials. By understanding the structural differences, evaluating the pros and cons, and analyzing how each material interacts with your specific body type and sleep position, you can confidently choose the best mattress for your home.

What’s the difference between a memory foam vs spring mattress?

At the most basic level, the difference between a foam vs spring mattress comes down to how it supports your body.

Spring mattresses, traditionally known as innerspring mattresses, use a core system of metal coils to provide support. When you push down on a metal spring, it pushes back. This reactive force provides a bouncy, highly responsive surface that keeps your body sleeping “on top” of the bed rather than sinking into it. The open space between the coils also allows for significant airflow, making these mattresses naturally breathable.

A memory foam mattress, on the other hand, relies on dense layers of polyurethane foam to support your weight. Originally developed by NASA in the 1970s to cushion test pilots during flights, memory foam is a viscoelastic material. This means it reacts to both pressure and body heat. Instead of pushing back against your weight, memory foam absorbs the pressure, softens around your body heat, and molds perfectly to your unique shape.

While spring mattresses offer a bouncy, resilient feel, memory foam provides a slow-moving, sink-in sensation that cradles your joints. Neither material is inherently superior to the other as they serve different sleep preferences and mechanical needs.

The anatomy of a spring mattress

The performance of a spring mattress comes down to what’s hiding beneath the surface. Modern innerspring mattresses have evolved far beyond the simple spring mattresses of the past.

Strip away the cover of a traditional spring mattress and you’ll see three main components: the base layer, the coil support core, and the comfort layers.

The coil support core

The support core is the main driver of how a spring mattress feels, how durable it is, and how much motion it transfers.

• Bonnell coils: The oldest and most common coil type in budget mattresses. They are hourglass-shaped and connected in a continuous network. They are durable and supportive, but they transfer motion easily.
• Offset coils: These are also hourglass-shaped, but with flattened tops and bottoms. This design helps them contour better and make less noise than Bonnell coils.
• Continuous coils: Made from a single piece of wire formed into many coils. They are strong and durable but tend to isolate motion poorly.
• Pocketed coils (marshall coils): The standard in many high-quality spring and hybrid mattresses. Each coil is wrapped in fabric, so it can move independently. This improves motion isolation and helps the mattress contour more closely to the body.

Coil gauge

You’ll often see “coil gauge” mentioned when looking at spring mattresses. All it means is the thickness of the wire that makes up the coils.

• A lower gauge number, such as 12 or 13, means thicker wire and a firmer feel.
• A higher gauge number, such as 15 or 16, means thinner wire and a softer feel.
• Some mattresses use multiple gauges, with thicker coils around the edges for support and thinner coils in pressure-relief zones.

The comfort layers

Because springs alone would feel too firm, manufacturers add comfort layers above the coil system. In traditional spring mattresses, these may include cotton, wool, or polyfoam. Some models also have a pillow top or Euro top, which adds an extra layer of cushioning for a plusher surface feel.

Anatomy of a memory foam mattress

An all-foam mattress has no metal coils. Instead, it uses stacked foam layers to provide support and comfort.

The high-density base layer

The bottom layer is high-density polyurethane foam. This firm, rigid layer gives the mattress its shape and keeps you from sinking through to the foundation or floor.

The transition layer

Above the base is usually a transition layer. It is softer than the base but firmer than the top layers. Its role is to add contouring while preventing heavier areas, such as the hips, from pressing too sharply into the base.

The memory foam comfort layer

The top layer contains the memory foam that creates the pressure-relieving, body-hugging feel. Manufacturers now use several types of memory foam, often to improve temperature control:

• Traditional memory foam: The original closed-cell foam. It offers strong pressure relief but tends to retain heat.
• Open-cell memory foam: This version has interconnected air pockets that help heat escape and improve airflow.
• Gel-infused memory foam: Cooling gel is added to help pull heat away from the surface and create a cooler initial feel.
• Copper-infused memory foam: Copper helps move heat away from the body and offers natural antimicrobial properties that can help reduce bacteria and odor.

Are memory foam mattresses good?

For many sleepers, yes, memory foam mattresses are good. Memory foam shapes itself around you, can relieve pressure, and prevents you from feeling your partner move at night. Springs can’t do that.

• Pressure relief: Memory foam contours to your body and spreads weight evenly, reducing stress on hips and shoulders. This makes it a strong choice for people with muscle aches.
  
• Motion isolation: Dense foam absorbs movement where it happens, preventing it from traveling across the bed. Partners can move freely without disturbing each other, which benefits light sleepers.
  
• Hypoallergenic properties: The tight cell structure of memory foam leaves less room for dust mites and allergens compared to the open spaces in spring mattresses, offering a potentially cleaner sleep environment.

What are the downsides of a memory foam mattress?

While foam beds can offer strong pressure relief, they also have drawbacks that may not suit every sleeper.

• Heat retention for hot sleepers: Memory foam often sleeps warm because it softens with body heat and hugs the body, which can limit airflow. Dense foam also has little natural ventilation. Gel-infused and open-cell foams may help, but all-foam mattresses usually sleep warmer than spring models.
  
• Weighted effect: Memory foam responds slowly, so it takes time to regain its shape after pressure is removed. For combination sleepers who change positions often, this can make movement feel more difficult. Some people say it feels like they sink in too much or get stuck in the bed.
  
• New mattress smell: A new memory foam mattress may have a chemical smell after unboxing. This new mattress smell occurs when manufacturing compounds are released into the air. The odor usually fades within a few days in a well-ventilated room, though it may still bother sensitive sleepers.

Spring mattresses pros and cons

Just as memory foam has its loyalists, many people refuse to sleep on anything other than a traditional innerspring mattress. Here is an honest look at the advantages and disadvantages of choosing a spring mattress.

The advantages of spring beds

• Natural cooling and airflow: The internal structure of a spring mattress is mostly empty space. Every time you move, you compress the coils and push warm air out of the sides of the bed, while drawing cool room air in. This constant air exchange prevents heat buildup, making spring beds an excellent choice for naturally hot sleepers.
  
• Responsive bounce: Coils provide immediate, hyper-elastic responsiveness. There is no slow sink-in feeling. The bounce makes it incredibly easy to change sleep positions, get in and out of bed, and engage in intimate activities. You sleep “on” the mattress, not “in” it.
  
• Strong edge support: Sitting on the edge of a memory foam mattress often leads to severe compression, making you feel like you might slide off onto the floor. Spring mattresses typically feature reinforced steel coils around the perimeter. This strong edge support increases the usable surface area of the bed and makes it much easier to sit on the edge while tying your shoes or getting dressed.

The disadvantages of spring beds

• Poor pressure relief: Even with a pillow top, traditional spring beds struggle to distribute body weight evenly. The coils push back firmly against your hips and shoulders, which can lead to numbness, tingling, and morning stiffness, particularly for side sleepers.
  
• Motion transfer: As mentioned earlier, unless the bed utilizes high-quality pocketed coils, traditional continuous or Bonnell coil systems will transfer nearly all movement across the bed.
  
• Noise and shorter lifespan: Over time, metal fatigues. The friction between coils can lead to squeaking and creaking noises. Furthermore, as the springs lose their tension, the mattress can develop permanent sagging in the areas where you sleep most often. Generally, traditional innerspring beds have a shorter lifespan than high-density memory foam beds.

How to choose mattress based on sleep position

The best mattress for you depends heavily on how you position your body at night. Different sleep positions alter the curvature of your spine and dictate where your body needs support versus where it needs cushioning.

Sleep Position	What Happens	What You Need	Firmness Range	How It Helps
Side Sleepers	Body weight presses into a small area at hips and shoulders. Too much firmness misaligns the spine, causing back and shoulder pain.	All-foam mattress or plush hybrid	Medium-soft to medium	Deep foam contouring allows shoulders and hips to sink in properly, maintaining a neutral, straight spine position.
Back Sleepers	Spine needs to maintain its natural S-curve. Soft beds create a hammock effect; firm beds leave the lower back hanging.	Medium-firm memory foam, hybrid, or innerspring	Medium-firm	Balances support and cushioning, firm enough for hip alignment, soft enough to cradle the lumbar region.
Stomach Sleepers	Heavy midsection pulls hips down below shoulder level, creating dangerous spinal arching and chronic lower back strain.	Firm spring mattress or very firm all-foam with thin comfort layers	Firm to very firm	Prevents any hip sinkage to keep the spine level. Deep-contouring memory foam is not suitable for this position.
Combination Sleepers	Move between positions all night. Require a bed that works for every position and makes switching easy.	Medium-firm hybrid	Medium-firm	Responsive coil support allows effortless movement. Moderate foam cushioning handles side-sleeping without trapping you.

DISCLAIMER: This information is for general educational purposes only and is not medical advice. For guidance specific to your needs, seek advice from a qualified medical professional.

10 key factors to consider when buying the best mattress

Finding the best mattress requires more than just choosing between foam and springs. As you prepare to make your purchase, use this 10-point checklist to evaluate your options.

So, what mattress is right for you?

The debate between foam vs spring mattress models will never yield a single, universal winner because sleep is a deeply personal experience.

If you crave the classic, resilient bounce of a traditional bed, naturally sleep warm, and want sturdy edges, a modern pocketed spring mattress will serve you well. For shoppers comparing options, Ashley’s mattress collection includes innerspring and hybrid designs that can appeal to those looking for responsive support and everyday comfort.

If you suffer from joint pain, wake up with numb shoulders, share a bed with a restless partner, and prefer the sensation of being gently hugged by your bed, a memory foam mattress is the clear choice.

And if you find yourself caught in the middle, desiring the pressure relief of foam but the responsive support and airflow of metal coils, a high-quality hybrid mattress offers a masterclass in compromise.

By analyzing your sleep position, and prioritizing the materials that solve your specific sleep disruptions, you can confidently navigate the mattress market and select the perfect bed for years of restorative rest.

Want to compare other mattress types? Check out our guides on hybrid mattress vs memory foam and  hybrid vs innerspring mattress.