King Koil Mattress Review (Updated 2023)

7.6 Overall Score






Motion Transfer


Pressure Relief


Response Time




Edge Support



Best For

This is the best brand for shoppers who want to compare various mattress types and thickness

Sleepers who prefer to utilize the entire mattress surface

King Koils sells more than twenty mattresses


There isn’t enough information online to help shoppers make an informed choice

The support offered by these beds doesn’t last long

Our Verdict

On a King Koil mattress, you can enjoy a comfortable sleep in any position. This renowned brand offers a wide range of mattress types to cater to various preferences. Whether you prefer the contouring feel of memory foam or the responsive bounce of innerspring mattresses, King Koil has the perfect option for you. It’s important to note that King Koil mattresses do not contain any fiberglass, ensuring a safe and pleasant sleeping experience. However, some customers have raised concerns about the durability of these beds.

When it comes to mattress shopping, having plenty of options is important. Therefore, many customers prefer to shop from a brand that offers a wide range of mattresses. If this sounds like you, you might want to consider the King Koil brand.

King Koil sells a wide range of mattresses including innerspring, all-foam and hybrid models. There are many different thicknesses and firmness options to choose between at a range of price points, which means that you should be able to find one to suit your budget. However, there are concerns that King Koil mattresses are not very durable.

In this article, we’ll tell you everything you need to know about King Koil mattresses including must-know facts about construction, pricing and key features. Hopefully, we’ll help you answer that all-important question- should I buy a King Koil mattress?

  • There are several benefits of choosing a King Coil mattress. These include:
  • Wide availability in brick-and-mortar stores nationwide
  • Variety of mattress types, firmness and price
  • Strong edge support
  • The main con of buying a King Koil mattress is lack of durability, and some customers have mentioned that their mattresses lose support quite quickly. Also, King Koil does not publish detailed product specifications for their mattresses including important factors such as foam density and layer thickness. So, this can make it hard to compare King Koil mattresses with other brands.

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King Koil Mattress Range and Construction

King Koil sells innerspring, hybrid and all-foam mattresses across five collections. These collections contain 20 mattresses altogether and offer consumers a very wide range of choices. In this section, we’ll look at the construction of all five mattress collections.

World Edition

The King Koil World Edition collection features five innerspring mattresses in a range of comfort layers and finishes. The mattresses are put together as follows:

Monaco Plush

The King Koil Monaco Plush mattress has a pocketed innerspring core. The comfort layers are made from polyfoam and gel-infused memory foam which gives the mattress the ability to conform to the shape of your body. The mattress is finished with a gel-infused foam cover.

Monaco Euro Top

The King Koil Monaco Euro Top mattress has a similar construction to the previous model. However, it offers extra support for your lower back as its support is arranged into zones. This could make it a good choice for people who suffer from back pain at night.

Siena Firm

The King Koil Siena Firm mattress has a supportive base layer made from individually pocketed springs. Its polyfoam comfort layers that give it a firm and responsive feel, so it doesn’t give the ‘sinking in’ sensation that you get with traditional memory foam. Like the Monaco models, it has a gel foam quilted cover.


The Sydney mattress is another innerspring mattress with comfort layers made from polyfoam in either a Firm or a Euro Top finish.

World Luxury

The King Koil World Luxury collection features six different mattresses, all of which are innerspring (Kingsley) or hybrid (Montego) models. The World Luxury collection is constructed as follows:


The Kingsley mattresses have supportive innerspring cores. There are three options if you select this family of mattresses: Firm, Plush and Euro Top. Each spring in the support system is contained in its own polyfoam pocket and the comfort layers are made from polyfoam and memory foam. This means that they can conform to the shape of your body and relieve pressure. Each mattress features a breathable cover made from memory foam, silk and wool.


Like the Kingsley mattresses, Montego models feature foam-encased innersprings and a gel foam and silk-wool blend cover. The comfort layers are made from polyfoam, regular memory foam and gel foam. King Koil Montego mattresses come in three different options: Luxury Firm, Luxury Plush and Luxury Pillow Top.

World Extended Life

The King Koil World Extended Life collection features the Athens mattress, a latex and innerspring hybrid. The support layer is made from coils that sit inside their own polyfoam pockets, and it has an adaptable comfort layer of Talalay latex foam sandwiched between two layers of polyfoam. The mattress is finished with a gel foam cover and you can select between Firm and Plush.

World Luxury Intimate

The King Koil World Luxury Intimate collection features the Vienna hybrid mattress. It is available in three firmness options: Plush, Firm and Euro Top. The mattress gets its support from a layer of pocketed springs surrounded by polyfoam and the comfort layers are made from latex, memory foam, gel and wool.


The iMattress collection contains four different mattresses. Two are all-foam and two are hybrids.

G10 Firm

The King Koil G10 Firm mattress has a base layer of highly supportive polyfoam and a comfort layer of memory foam. Its cover contains a copper infusion that helps you to sleep cool by wicking heat away from your body.

G12 Plush

The G12 Plush mattress features the same construction as the G10 Firm. However, it has a softer feel.

XS 10 Hybrid Firm

The XS 10 Hybrid Firm is a memory foam and innerspring hybrid. It features a cooling fabric cover containing copper fibers that can draw heat away from your body.

XS 50 Hybrid Plush

The XS 50 Hybrid Plush is also a memory foam and innerspring hybrid. It shares the same construction and cooling copper cover as the XS 10, although it has a softer feel.

How Much Does a King Koil Mattress Cost?

King Koil sell mattresses at a wide range of price points. How much you pay depends on which model you select and which third-party retailer you buy from. You can expect to find a queen size mattress for between $700-$3,200, so the price variation for King Koil mattresses is quite wide.

King Koil Mattress Firmness

King Koil make mattresses in a variety of firmness options ranging from soft to firm. So, you should be able to find a King Koil mattress in a firmness that suits you. However, you should be aware that the names of some of the mattress models can be misleading. For example, some of the King Koil mattresses described as ‘firm’ are actually medium. So, you should check out our list below to find out the firmness of King Koil mattresses.

When using the information on this list, it’s important to understand that mattress firmness is usually given a rating of 1-10, where 1 is the softest and 10 is the firmest. In this list, we’ve ordered the King Koil mattress collection from softest to firmest.

  • Kingsley Euro Top: 3 (Soft)
  • Monaco Luxury Plush: 3 (Soft)
  • Montego Luxury Plush: 3 (Soft)
  • Sydney Euro Top: 4 (Medium Soft)
  • Kingsley Plush: 4 (Medium Soft)
  • Montego Luxury Pillow Top: 4 (Medium Soft)
  • Vienna Plush: 4 (Medium Soft)
  • Vienna Euro Top: 4 (Medium Soft)
  • G12 Plush: 4 (Medium Soft)
  • XS 50 Hybrid Plush: 4 (Medium Soft)
  • Sydney Firm: 5.5 (Medium)
  • Monaco Euro Top: 5.5 (Medium)
  • Kingsley Firm: 5.5 (Medium)
  • Montego Luxury Firm: 5.5 (Medium)
  • Athens Plush: 5.5 (Medium)
  • Vienna Firm: 5.5 (Medium)
  • G10 Firm: 5.5 (Medium)
  • XS 10 Hybrid Firm: 5.5 (Medium)
  • Siena Firm: 7 (Firm)
  • Athens Firm: 7 (Firm)

Is a King Koil Mattress Right for my Sleeping Position?

King Koil mattresses can suit any sleeping position because its collections contain a wide range of mattresses in different materials and firmness options. So, you should be able to find a King Koil mattress that suits your needs well. Which King Koil mattress you should choose comes down to several factors including your body weight, sleeping position and sense of comfort.

As a rule, people who sleep on their sides need a softer mattress. This is because a softer mattress will reduce pressure on your hips and shoulders by allowing your body to sink in. Therefore, we recommend that side sleepers weighing less than 130 pounds select a Soft or Medium Soft King Koil mattress. Side sleepers with average body weights or higher may prefer a Medium mattress.

Front and back sleepers tend to need firmer support to keep their spine in a healthy alignment. Some people with this sleeping style may find a Medium King Koil mattress comfortable, but if you have a bodyweight over 250 pounds or a painful back condition, you may find a Firm mattress gives better support.

King Koil does not currently make a Medium Firm (universal comfort) mattress, so combi-sleepers and couples with differing sleep styles are probably best off going for a Medium option. If this doesn’t feel firm enough for you, it’s probably worth looking at a different mattress brand available in Medium Firm such as the Nectar.

Do King Koil Mattresses Sleep Cool?

Many King Koil mattresses sleep cool. However, the answer to this question depends on which model you buy. King Koil’s hybrid and innerspring mattresses are breathable because they feature support cores made from pocketed springs, which means that there are gaps between the coils. So, air can circulate more freely, allowing heat to escape during the night.

King Koil also uses materials in some of their mattresses that are specially designed to wick away heat. Many King Koil mattresses feature layers of memory foam containing heat-wicking gel. Beds in the iMattress range also feature comfort layers made from copper-infused memory foam. Copper is a great conductor of heat, allowing heat to away from your body while you sleep. If you tend to sleep hot, we recommend selecting a King Koil mattress featuring these cooling sleep technologies.

Where to Buy

King Koil does not sell its mattresses through the company website, but you can buy a King Koil mattress through third-party brick-and-mortar retailers. You can find your nearest King Koil retailer by following this link:

Shipping Information

There is no specific shipping information for King Koil mattresses because they are sold exclusively through third-party stockists. Each third-party retailer will have its own shipping policy, so you should discuss shipping arrangements and fees with your retailer before you buy.

King Koil does not offer a white glove delivery or old mattress removal service. However, your mattress retailer may be able to provide these services for you depending on its company policy.

Sleep Trial and Returns

King Koil does not provide a sleep trial for its customers and does not have a brand-specific returns policy. This is because King Koil mattresses are only sold by third-party retailers. So, you should ask your chosen stockist about sleep trials and returns before buying, as these will vary from retailer to retailer.


King Koil mattresses come with a 10 or 25-year warranty, and the total coverage period depends on which model you buy. The warranty entitles customers to have their mattress repaired or replaced if it has a manufacturing fault. However, customers are responsible for paying any shipping costs associated with repair or replacement. The warranty covers indents deeper than 0.5 inches in the surface of the mattress if it has a 25-year warranty, or 1.5 inches if it has a 10-year warranty and protruding springs. King Koil warranties do not cover normal wear and tear, bent border wires or damage caused by owner misuse such as staining.

These warranties are non-transferrable. This means that they are only valid for the original purchaser and do not apply if the mattress changes ownership.

How do King Koil Mattresses Compare to Other Brands?

Before you buy a King Koil mattress, we recommend checking out other mattress brands as well to help you decide which one is best for you because there are many companies out there offering great-value and durable mattresses online. By clicking below, you can see a range of similar mattresses to the King Koil collections.

Alternatives to the King Koil Mattress Range

King Koil mattresses will not be the right choice for every consumer. If you’re looking for a mattress brand that offers a wide range of choice and good pressure relief, a King Koil bed may be a good option for you. However, there are question marks over the durability of King Koil mattresses. It’s important to be aware that there are many long-lasting mattress brands out there, so it’s worth shopping around.

Here at Sleep Aim, we always suggest checking out our top three products before committing to a mattress: the Puffy, the Novosbed and the Nectar. These three mattresses are all-foam options that offer customers a good balance of support and comfort for a fair and affordable price. Even better, they are highly durable. So, any one of these mattresses should stand the test of time with proper care.

Puffy Mattress

We’ve reviewed a huge number of mattresses, and the Puffy has come out on top. This affordable memory foam bed is our #1 mattress recommendation because it combines comfort, support and value for money in one durable mattress.

Unlike many memory foam mattresses, the Puffy mattress maintains a cool and comfortable temperature. This is because the manufacturers have used innovative sleep technology to help make it as breathable as possible. So, the Puffy allows you to get the benefits of memory foam without the overheating so common with foam beds.

So, what type of sleeper does the Puffy suit best? We think side sleepers are most likely to give Puffy the thumbs up. This is because its medium firmness lets your body sink in comfortably without compromising in terms of support. That being said, front and back sleepers may well love it too. However, those with higher bodyweights may benefit from a firmer model like the Nectar mattress.

Novosbed Mattress

The Novosbed is another highly recommended product for those looking for the best memory foam mattress in 2023. Like many similar mattresses, it has a supportive foam core layer with soft, conforming memory foam comfort layers. So, the Novosbed provides good spinal and pressure relief at the same time.

The Novosbed sleeps cooler than most comparable models because it features advanced aerated foams. These foams allow better air circulation than traditional memory foam, so body heat can escape easily during the night instead of building up.

The Novosbed is available in three firmness settings. If you want to fine-tune the mattress, you can customize the firmness more by using their Comfort+ service. So, the Novosbed could be a good choice if you have very particular support or comfort needs.

Nectar Mattress

The Nectar mattress is a breathable memory foam bed and is the brainchild of the well-known online mattress retailer Nectar sleep. Its structure gives sleepers good back support thanks to a dense polyfoam core layer, and an adaptable comfort layer reduces pressure on your joints while you sleep.

One of the stand-out features of the Nectar mattress is its responsive feel. Nectar achieves this by using open-cell technology in the comfort layer, creating a more open structure that gives it more bounce and less sinkage than standard memory foam. Many people don’t like the deep sinking sensation of memory foam, so the Nectar might be right for you if you want deep pressure relief with a bouncier sleeping surface.

Another benefit of open-cell technology is that it makes the foam more breathable, allowing air to circulate beneath your body while you sleep. More air circulation means less heat retention, so the Nectar sleeps cooler than many of its competitors.


It’s important to find out as much as you can about a mattress before you commit to a purchase. To make this as easy as possible, we will share our King Koil mattress FAQs with you.

Q: Are King Koil mattresses a good choice for side sleepers?

A: King Koil mattresses can be a good choice for side sleepers. However, this depends on which King Koil mattress you choose. Many feature body-conforming comfort layers. which can help take the pressure off your hips and shoulders when sleeping on your side. We recommend that side sleepers choose a medium soft or medium King Koil mattress, as these firmness settings are the most likely to be comfortable in this position.

Q: How firm are King Koil mattresses?

A: King Koil make mattresses in a range of firmness options ranging from soft to firm. However, there is no universal comfort (medium firm) option, which is a firmness setting highly recommended for combi-sleepers and couples.

Q: How thick are King Koil mattresses?

A: King Koil mattresses come in a variety of thicknesses ranging from 11.5 to 14 inches. However, King Koil does not currently publish thickness measurements for every mattress in their range.

Q: Do King Koil mattresses sleep cool?

A: Most King Koil mattresses sleep cool. Their hybrid and innerspring mattresses are the coolest options as their structure allows air to circulate in the base layer so that heat can escape in the night. If you want to sleep cool, we recommend choosing a King Koil mattress with gel particles or copper fibers in the comfort layer. These materials sleep cool because they transfer heat away while you sleep.

Q: What type of mattresses do King Koil make?

A: King Koil make all-foam, innerspring and hybrid mattresses. Their hybrid models combine innerspring cores with adaptable comfort layers made from materials such as memory foam or latex.

Q: Are King Koil mattresses durable?

A: King Koil mattresses are not as durable as some other options, and customers have complained that their mattresses lose support too quickly. If you want a long-lasting mattress, you may be better off looking at a more durable mattress brand like Puffy.

Q: Do King Koil mattresses smell?

A: King Koil mattresses release an off-gassing smell at first, as is usually the case with mattresses like the King Koil models that have foam elements. This smell is harmless and shouldn’t last long but airing the mattress will help the smell to fade away more quickly.

Q: How easy are King Koil returns?

A: King Koil does not have its own returns policy because its mattresses are sold only through third-party retailers. If you want to return a King Koil mattress, you should defer to the returns policy of the store you bought it from.

Q: Which base should I use with a King Koil mattress?

A: You can use most bed frames and bases with a King Koil mattress, so you will probably be able to use your current bed frame. However, you should make sure any base or foundation you use is supportive and the correct size. Otherwise, you could void the warranty.

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The bottom line

King Koil mattresses could be a choice for people who want a wide variety of mattress options or wish to buy from a brick-and-mortar retailer. Most customers are satisfied with the initial comfort of their King Koil mattress, although it’s important to be aware that King Koil mattresses could lose their support over time.

To help you choose the right mattress for you, we suggest checking out our huge range of sleep resources and mattress reviews here at Sleep Aim. Our expert guidance can help you decide which mattress is right for you, so you get the best product for your needs and budget.

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