Best King-Size Organic Mattresses


Our review process

We've already done all the heavy lifting researching king-size organic mattresses. That way, you don't have to pour over confusing infographics about choosing the right one for you. By reading this guide, you'll have an excellent grasp on what types of mattresses are available on the market, so you can confidently buy a mattress that will ensure comfortable sleep for years to come.

Before deciding on your next king-size organic mattress, here are some things you'll want to know. King-size mattresses are ideal for couples, offering plenty of space for you to spread out. They measure 76" X 80" and are perfect for master bedrooms. However, they are not great for small spaces, taking up a majority of the free space in the room. Also, they are large and heavy, making them difficult to transport and flip.

Organic mattresses contain no pesticide residues. They feature non-toxic fire barrier methods which are much safer than traditional flame retardants. Featuring biodegradable materials, they will break down in much less time than other non-biodegradable mattresses that sit in landfills for up to 100 years. These mattresses are made from materials that are sustainably farmed and manufactured. They are created with hypoallergenic materials.

Our Top Ranking Mattresses:
Product NameBrandComfortType
Best Overall Score
1
An image of TFS Extra Firm King-Size Mattress
TFS Extra Firm King-Size Mattress
TFS
extra firm
Runner Up
2
An image of Dreamfoam Bedding Firm Latex Foam King-Size Mattress
Dreamfoam Bedding Firm Latex Foam King-Size Mattress
Dreamfoam Bedding
firm
latex foam
For Side Sleepers
3
An image of Natura Bourdolay 3VPHH4 NET Plush King-Size 10-Inch Mattress
Natura Bourdolay 3VPHH4 NET Plush King-Size 10-Inch Mattress
Natura
plush
4
An image of TFS Soft Innerspring King-Size Mattress
TFS Soft Innerspring King-Size Mattress
TFS
soft
innerspring
5
An image of TFS Firm Innerspring King-Size Mattress
TFS Firm Innerspring King-Size Mattress
TFS
firm
innerspring
Our Top Ranking Mattresses
Customer Rating
Brand
TFS
Comfort
extra firm
Type
Customer Rating
Brand
Dreamfoam Bedding
Comfort
firm
Type
latex foam
Customer Rating
Brand
Natura
Comfort
plush
Type
Customer Rating
Brand
TFS
Comfort
soft
Type
innerspring
Customer Rating
Brand
TFS
Comfort
firm
Type
innerspring
Best Overall Score
An image of TFS Extra Firm King-Size Mattress

Looking for a green and eco-friendly mattress? Consider the TFS Extra Firm King-Size Mattress. This TFS mattress features an extra firm comfort level, giving stronger balance to pressure areas that we strain. It is made to conform to your body, so it offers a higher level of alignment as your shoulders and hips will sink more into the mattress. With antimicrobial benefits, it fights against any noxious mildew. Available in a king-size, it will provide maximum bed space. It is constructed with organic materials and is eco-friendly, so it has less VOCs and chemicals than ordinary mattresses. Featuring a cotton cover, it is simple to clean and won't hold onto odors. Designed with a chemical-free cover, this hypoallergenic mattress is a safe, non-toxic choice for your home.

    Pros
    • Extra firm mattress provides overall support of your body for uninterrupted sleep
    • Comes with a cotton cover, protecting the mattress while also adding a bit of cushioning
    • Antimicrobial benefits assist people susceptible to allergies
    Cons
    • King-size can be difficult to move
    • Extra firm mattress can put uncomfortable pressure on pressure points
Runner Up
An image of Dreamfoam Bedding Firm Latex Foam King-Size Mattress

The Dreamfoam Bedding Firm Latex Foam King-Size Mattress is best for those who need an allergen-free mattress. This hypoallergenic mattress has antimicrobial benefits, which assist people sensitive to allergies. It has a supportive design, aligning your spine horizontally when sleeping on your side. Featuring a firm comfort level, it will keep your lower back from sinking into the mattress, leading to improved circulation and higher quality of sleep. Available in a king-size, it offers an ample amount of room to spread out and relax.

This organic mattress has a latex foam construction, which combats mold and dust mites naturally. This organic mattress keeps the air free of VOCs. It is built with durable materials, which allows it to remain in excellent condition for years to come. Featuring a specialized material that is fire-resistant, it is a safe option for your bedroom.

    Pros
    • Firm mattress promotes a deeper sleep
    • Built with antimicrobial materials to decrease the chances of bacteria developing
    • Supportive design ensures proper spinal support and alignment
    Cons
    • King-size does not fit in compact spaces
    • Firm mattress can put painful pressure on pressure points
    • Latex foam construction might feel too "spongy" for some
For Side Sleepers
An image of Natura Bourdolay 3VPHH4 NET Plush King-Size 10-Inch Mattress

The Natura Bourdolay Plush King-Size Mattress is perfect for people who frequently have allergies. This hypoallergenic mattress features a plush comfort level, providing the perfect combination of firmness and softness. It has a 10-inch thickness, so after long periods of time it won't sag in the middle. Available in a king-size, it ensures that you'll have a generous amount of room to spread out and have a good night's sleep. With organic materials, it keeps the air free of toxins. This Natura mattress has a supportive design, aligning your spine horizontally when sleeping on your side. It works to regulate your body temperature, dissipating heat so you can sleep more comfortably.

    Pros
    • Plush mattress for ultimate comfort and softness
    • Supportive design ensures proper spinal support and alignment
    • Works to regulate your body temperature, dissipating heat so you can sleep more comfortably
    Cons
    • King-size does not fit in small rooms
    • Plush mattress can get lumpy or sag over time
    • 10-inch thickness doesn't provide the best support
Additional Picks
An image of TFS Soft Innerspring King-Size Mattress

Looking to go the eco-friendly route? Consider the TFS Soft Innerspring King-Size Mattress. With an innerspring construction, this TFS mattress will provide poor motion isolation. It has a supportive design, aligning your spine horizontally when sleeping on your side. This TFS mattress features a soft comfort level, making it suitable for people who sleep on their side as it better cushions the hips and shoulders. Available in a king-size, it offers an ample amount of room to spread out and relax. Featuring a cotton cover, it is easy to clean and won't retain odors.

Featuring a jacquard cover, this organic mattress gives your mattress a more luxurious look. With a chemical-free cover, it is a safe, non-toxic option for your bedroom. This TFS mattress has a knitted cover, which ensures breathability and easy care. It is eco-friendly, making them resistant to mold and other bacteria.

    Pros
    • Soft mattress prevents pressure by balancing your body without having your back or joints sink
    • Built with a cotton cover for superior coziness and comfort
    • Supportive design ensures proper spinal support and alignment
    Cons
    • King-size can be difficult to move
    • Innerspring construction does not provide sufficient pressure point relief
An image of TFS Firm Innerspring King-Size Mattress

For serious comfort and a restful night's sleep, consider the TFS Firm Innerspring King-Size Mattress. This organic mattress has a supportive design, aligning your spine horizontally when sleeping on your side. Designed with an innerspring construction, it is able to support numerous sleepers, including people with back pain. This TFS mattress features a firm comfort level, providing superior support to stop the body from sinking. Available in a king-size, it offers plenty of room to spread out and relax. This cotton mattress is simple to keep clean and won't retain odors. This TFS mattress has a knitted cover, which ensures breathability and easy care. It has a chemical-free cover, so it won't emit dangerous chemicals that can negatively impact your health. It features a jacquard cover, elevating the overall comfort and support of the mattress due to the extra padding.

    Pros
    • Firm mattress is perfect for people who need precise spinal alignment
    • Comes with a cotton cover, making it ideal for people who are affected by allergies and skin sensitivities
    • Supportive design ensures proper spinal support and alignment
    Cons
    • King-size does not fit in small rooms
    • Firm comfort level can put uncomfortable pressure on pressure points
    • Innerspring construction tends to be very heavy and difficult to move around
An image of Chattam and Wells Francesca Plush Foam King-Size 13-Inch Mattress

The Chattam and Wells Francesca Plush Foam King-Size Mattress is perfect for people who are more sensitive to allergies. This organic mattress features a plush comfort level, making it an ideal choice for those looking for a soft surface with added cushioning. It has heat regulation technology, which prevents you from getting overheated at night. Available in a king-size, it offers an ample amount of room to stretch out and relax. Featuring a 13-inch thickness, it can sustain a lot of weight so it won't sink in easily.

With a foam construction, this thick mattress needs very little maintenance and can last for long periods of time. It includes three layers and has a ventilated design, optimizing the flow of air, so you always feel cool and comfortable while asleep. With organic materials, it keeps the air free of VOCs. This stretch knit Chattam and Wells mattress is built with a tencel cover, making it one of the most environmentally-friendly fabrics.

    Pros
    • Plush mattress for the ideal combination of firmness and softness
    • Features a tencel cover, making it one of the most environmentally-friendly fabrics
    • Heat regulation technology prevents you from getting overheated at night
    Cons
    • King-size can be difficult to move
    • Plush mattress can get lumpy or sag over time
    • 13-inch thickness may appear disproportional in some bed frames
An image of Sleeplace Memory Foam King-Size Foam Base 12-Inch Mattress

Do you get overheated at night? The Sleeplace Memory Foam King-Size Mattress might be a good option for you. With a memory foam construction, this organic mattress lets you toss and turn and then re-contours to your body after you've found a comfortable position. It has a supportive design, aligning your spine horizontally while sleeping on your side. It has low VOC emission so that you won't be inhaling dangerous chemicals while sleeping.

This SLEEPLACE mattress has a 12-inch thickness, so after long periods of time it won't collapse around the edges. Available in a king-size, it offers an ample amount of room to spread out and relax. It features a foam base, ensuring all major pressure points are well supported. It features a washable cover, keeping it free from dirt or stains over long-term use. With a jacquard cover, this organic mattress provides your mattress with a more luxurious feel. It features a ventilated design, so it will remain dry in order to prevent mildew and mold from growing.

    Pros
    • Features a foam base, ensuring all dominant pressure areas are adequately supported
    • Emits low levels of VOC, making it an eco-friendly choice with less overall toxin exposure
    • Supportive design ensures proper spinal support and alignment
    Cons
    • King-size can be difficult to move
    • 12-inch thickness may appear bulky in some bed frames
    • Memory foam construction releases unpleasant odors
An image of TFS Plush Innerspring King-Size Mattress

For a combination of comfort and support, choose the TFS Plush Innerspring King-Size Mattress and enjoy a good night's sleep. This organic mattress has a plush comfort level, which is an ideal choice for those looking for a soft surface with added cushioning. Designed to conform to your body, it provides comfort and support tailored to your body. This organic mattress is available in a king-size, so you have a lot of space to sleep well.

This organic mattress will be constructed with sustainable materials, which are better for the environment. This organic mattress has an innerspring construction, which adjusts easily to your body shape. This knitted cotton mattress is simple to wash and won't retain odors. It is designed with a jacquard cover and has a chemical-free cover, so it won't emit toxic chemicals that can negatively impact your health.

    Pros
    • Plush mattress is an ideal option for those looking for a soft surface with added cushioning
    • Features a cotton cover, ensuring endless comfort to get you a better night's sleep
    • Conforms to your body for superior pressure point relief
    Cons
    • King-size does not fit in small rooms
    • Plush comfort level can get lumpy or sag over time
    • Innerspring construction does not provide sufficient pressure point relief
An image of Natura Organics EcoSoftique Ultra Plush Latex Foam King-Size Mattress

The Natura Organics EcoSoftique Ultra Plush Latex Foam King-Size Mattress is a good choice for anyone who needs an allergen-free mattress. With an ultra plush comfort level, this organic mattress supports your body in any sleeping position. Available in a king-size, it ensures that you'll have a generous amount of space to spread out and enjoy a good night's sleep. It is resistant to dust mites, reducing your exposure to allergens.

This organic mattress will keep the air clean, purified and free of toxins. This hypoallergenic mattress features a latex foam construction, resisting mold and dust mites naturally. It offers pressure point relief, ensuring your spine and joints are well supported in order to help with any sensitivity. It is designed with a moisture barrier, which decreases moisture build-up.

    Pros
    • Ultra plush mattress allows for a much softer sleeping surface
    • Provides pressure point relief, decreasing pain or stiffness while sleeping
    • Moisture barrier decreases wetness build-up
    Cons
    • King-size can be difficult to move
    • Ultra plush mattress can get lumpy or sag over time
    • Latex foam construction may feel too "spongy" for some
An image of Furniture of America MiBasics Plush Memory Foam King-Size 16-Inch Mattress

For a good night's rest and ultimate comfort, opt for a Furniture of America MiBasics Plush Memory Foam King-Size Mattress. With a 16-inch thickness, this organic mattress will not fit in all bed frames. With a plush comfort level, it is ideal for those who love extra softness. This organic mattress is available in a king-size, so you have a lot of space to sleep comfortably.

With a memory foam construction, this organic mattress reshapes itself to your body if you moved around in your sleep. It is constructed with organic materials, keeping the air free of chemicals. It has five layers, providing ultimate comfort and support. This organic mattress has memory foam and quilt foam layers.

    Pros
    • Plush mattress for utmost comfort and softness
    • King-size is ideal for areas with a lot of space
    • Includes five layers, providing ultimate comfort and support
    Cons
    • King-size does not fit in small rooms
    • Plush comfort level can become lumpy or sag over time
    • 16-inch thickness can tend to appear disproportional in some bed frames
Understanding More About the Types of King-Size Organic Mattresses Available:
Thinking About Which Comfort Level Is Best for You?
Firm Mattresses

Interested in getting a firm mattress? A king-size organic mattress could be a good choice for you. These mattresses are ideal for individuals who tend to sleep on their back and have a 34-36 pound indentation load deflection ranking. These improved circulation mattresses promote deeper and more restful sleep. They evenly distribute your weight, adequately supporting your joints and other vulnerable areas. However, these firm mattresses can put painful tension on specific pressure points, including the shoulders and hips. Another downside is that they may be uncomfortable if you're not used to sleeping on firm surfaces, so it'll take some time to get used to them.

Ultra Plush Mattresses

Looking for a good ultra plush mattress? Consider a king-size organic mattress. These mattresses are built with a 14-19 pound indentation load deflection ranking and are ideal for people who tend to sleep on their sides. These back problems and/or joint pain mattresses help ensure that any discomfort you have doesn't get worse. They give contouring support, adjusting to your body shape for optimal comfort. One downside is that ultra plush mattresses may be problematic if different sleepers will be using the bed, causing the surface to sink if there is a significant weight difference. On top of that, they can become lumpy or sag with extended use, so your body won't be adequately supported when sleeping.

Extra Firm Mattresses

Debating whether to get an extra firm mattress? We can help you make your decision by giving you the information that you need. These improved circulation mattresses promote deeper and more restful sleep. Extra firm mattresses are suitable for back sleepers and are designed with a 39-42 pound indentation load deflection ranking. They deliver proper weight distribution, adequately supporting your joints and other sensitive areas. One downside is that extra firm mattresses can put strain on specific pressure points, including the shoulders and hips. On top of that, they may be uncomfortable if you're not used to sleeping on hard surfaces, so it'll take a couple of days to get used to them. Interested in an extra firm mattress? Check out this one.

Mattress Type: Which One Is Right for You?
Memory Foam Mattresses

If you're thinking about getting a memory foam mattress, this king-size organic mattress could be a good choice for you. Featuring various foam types, these mattresses provide the perfect amount of cushion. With pressure-point relief, they will eliminate any pain in your joints. With superior motion isolation, they will make sure your partner doesn't wake you when moving. A potential downside is that these mattresses can smell a bit like chemicals at first, sometimes lasting up to a couple of weeks before wearing off. Moreover, they aren't waterproof, so you'll want to be careful and make sure that they don't come into contact with too much moisture.

Innerspring Mattresses

If you're thinking about getting an innerspring mattress, this king-size organic mattress could be a good choice. These breathable innerspring mattresses will provide proper airflow and ventilation to prevent moisture build-up. Designed to dissipate heat instead of absorb it, they ensure that you'll stay cool and comfortable throughout the night. They have various types of coils, so you can choose what's right for you. They are designed with firm edges, reinforcing the sides of the mattress. Built with different materials, they will provide the right amount of comfort for a great night's rest. One downside is that they are prone to premature sagging, making them less comfortable and supportive. Also, innerspring mattresses don't contour to your body, so many individuals feel like they're too firm.

Latex Foam Mattresses

If you're thinking about getting a latex foam mattress, this king-size organic mattress could be a good choice. These latex foam mattresses provide pressure-point relief by supporting the most sensitive areas of the body. They are made of various materials, giving you the choice between a variety of foam densities and comfort levels. They have a breathable design, which helps circulate air, keeping them in good shape over time. Designed to help you keep a cool body temperature, they are designed to dissipate heat instead of absorb it, so you can stay cool at night. They are low VOC (volatile organic compounds), which do not emit unwanted chemicals. However, they are more costly than other types of mattresses, so if you're on a budget, this might not be the best option for you. Another drawback is that these latex foam mattresses can smell a bit like chemicals initially, so you should air them out for at least 24 hours before putting sheets on.

Mattress Thickness: The Things to Know
6-8 Inch Mattresses

There's only one king-size organic mattress with a thickness of 6-8 inches. These mattresses are easy to move thanks to their lightweight build. They are suitable to use with standard-size sheets, making it easier to make your bed. These mattresses are ideal for trundle beds, so they are convenient for guests. However, they provide less support than other mattresses, so if you suffer from joint or back pain, then you should consider a thicker mattress. In addition, they wear out quickly, so you will have to replace them more frequently. These are just a few facts to help you decide what kind of king-size organic mattress the best for you.

10-12 Inch Mattresses

There are only two king-size organic mattresses with a thickness of 10-12 inches. With a standard thickness, these 10-12 inch mattresses can fit in nearly all bed frames. They have a strong design, so they can sustain more weight than other kinds of mattresses. These 10-12 inch mattresses are suitable to use with standard-size sheets, so it will be easy to find linens that fit. They are less likely to sag, ensuring that you sleep in the correct posture to prevent back problems. However, these 10-12 inch mattresses are higher off the ground, so they are harder to get into and out of. If you think a 10-12 inch mattress is a good choice, check out this one.

12-14 Inch Mattresses

If you're searching for a comfortable and supportive king-size organic mattress, you might want to think about getting a 12-14 inch mattress. These 12-14 inch mattresses have a solid construction, making them more durable and able to sustain more weight. They are suitable to use with standard-size sheets, which ensures you will never have problems finding sheets that fit. They are less likely to cave in, so the surface will remain level to ensure adequate support over time. A potential downside is that they have poor temperature control, so if you get warm at night, you might want to consider a thinner mattress with better temperature control. If you think a 12-14 inch mattress is a good choice, check out this one.