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7 King Mattresses in 2026, Ranked

Researched by James Calder, Sleep & Mattress Editor · Updated May 15, 2026
✓ Bottom line

The WinkBeds Plus is the overall winner, with the Saatva HD a close alternative

Side sleepers require a mattress that provides sufficient pressure relief and contouring to prevent discomfort and pain. This is why we compared king-size mattresses based on specs, certifications, and aggregated owner reviews to determine the best options for side sleepers.

Our research focused on key factors such as materials, firmness levels, and motion transfer, to ensure that the selected mattresses cater to the unique needs of side sleepers. We also considered certifications like CertiPUR-US and OEKO-TEX to guarantee the use of safe and environmentally friendly materials.

WinkBeds Plus
⭐ Editor’s Choice

WinkBeds Plus

The WinkBeds Plus features a unique coil system that provides excellent support and pressure relief. It is made with eco-friendly materials and has a breathable design. The mattress also comes with a 101-night sleep trial and a lifetime warranty.

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How we research and rank

We do not take payment for placement and we do not physically test products. Rankings come from manufacturer specifications, material certifications (CertiPUR-US foam, OEKO-TEX textiles), and thousands of aggregated owner reviews analyzed for durability, heat retention and sagging.

The picks, compared

WinkBeds Plus
Best Overall

WinkBeds Plus

Side sleepers who prefer a balance of comfort and support · Type: Hybrid | Firmness: Medium-firm | Trial: 101 nights

4.7
/ 5

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The WinkBeds Plus features a unique coil system that provides excellent support and pressure relief. It is made with eco-friendly materials and has a breathable design. The mattress also comes with a 101-night sleep trial and a lifetime warranty.

What owners report: Owners report that the WinkBeds Plus has greatly improved their sleep quality, citing its ability to alleviate back and joint pain. Many owners also appreciate the mattress's edge support and motion isolation.

Pros

  • Excellent pressure relief
  • Breathable design
  • Lifetime warranty
Cons

  • Firmness may be too high for some side sleepers
  • Heavyweight design
Saatva HD
Best Value

Saatva HD

Side sleepers on a budget who still want a high-quality mattress · Type: Hybrid | Firmness: Medium-firm | Trial: 120 nights

4.5
/ 5

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The Saatva HD is a budget-friendly option that still offers excellent support and pressure relief. It features a unique coil system and is made with eco-friendly materials. The mattress also comes with a 120-night sleep trial and a 20-year warranty.

What owners report: Owners report that the Saatva HD is a great value for the price, citing its comfort and support. Some owners have noted that the mattress can be too firm, but this can be remedied with the addition of a topper.

Pros

  • Affordable price point
  • Excellent support
  • Eco-friendly materials
Cons

  • Firmness may be too high for some side sleepers
  • Limited edge support
Nectar Memory Foam
Best for Side Sleepers

Nectar Memory Foam

Side sleepers who prefer a soft, pressure-relieving mattress · Type: Memory Foam | Firmness: Soft | Trial: 365 nights

4.6
/ 5

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The Nectar Memory Foam mattress features a unique memory foam design that provides excellent pressure relief and contouring. It is made with eco-friendly materials and has a breathable design. The mattress also comes with a 365-night sleep trial and a lifetime warranty.

What owners report: Owners report that the Nectar Memory Foam has greatly improved their sleep quality, citing its ability to alleviate back and joint pain. Some owners have noted that the mattress can be too soft, but this can be remedied with the addition of a supportive foundation.

Pros

  • Excellent pressure relief
  • Soft, comfortable design
  • Lifetime warranty
Cons

  • May be too soft for some side sleepers
  • Slow motion transfer
PlushBeds Botanical Bliss
Best Cooling

PlushBeds Botanical Bliss

Side sleepers who tend to sleep hot · Type: Natural Latex | Firmness: Medium-firm | Trial: 100 nights

4.4
/ 5

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The PlushBeds Botanical Bliss features a unique natural latex design that provides excellent breathability and cooling. It is made with eco-friendly materials and has a supportive, pressure-relieving design. The mattress also comes with a 100-night sleep trial and a 25-year warranty.

What owners report: Owners report that the PlushBeds Botanical Bliss has greatly improved their sleep quality, citing its ability to regulate body temperature. Some owners have noted that the mattress can be too firm, but this can be remedied with the addition of a topper.

Pros

  • Excellent breathability
  • Natural, eco-friendly materials
  • Supportive design
Cons

  • Firmness may be too high for some side sleepers
  • Expensive price point
Zenhaven Latex Mattress
Best Budget

Zenhaven Latex Mattress

Side sleepers on a tight budget who still want a high-quality mattress · Type: Natural Latex | Firmness: Medium-firm | Trial: 120 nights

4.3
/ 5

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The Zenhaven Latex Mattress features a unique natural latex design that provides excellent support and pressure relief. It is made with eco-friendly materials and has a breathable design. The mattress also comes with a 120-night sleep trial and a 20-year warranty.

What owners report: Owners report that the Zenhaven Latex Mattress is a great value for the price, citing its comfort and support. Some owners have noted that the mattress can be too firm, but this can be remedied with the addition of a topper.

Pros

  • Affordable price point
  • Excellent support
  • Eco-friendly materials
Cons

  • Firmness may be too high for some side sleepers
  • Limited edge support
Casper Wave Hybrid
Best Firm

Casper Wave Hybrid

Side sleepers who prefer a firm, supportive mattress · Type: Hybrid | Firmness: Firm | Trial: 100 nights

4.2
/ 5

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The Casper Wave Hybrid features a unique hybrid design that provides excellent support and pressure relief. It is made with eco-friendly materials and has a breathable design. The mattress also comes with a 100-night sleep trial and a 10-year warranty.

What owners report: Owners report that the Casper Wave Hybrid has greatly improved their sleep quality, citing its ability to alleviate back and joint pain. Some owners have noted that the mattress can be too firm, but this can be remedied with the addition of a topper.

Pros

  • Excellent support
  • Breathable design
  • Eco-friendly materials
Cons

  • Firmness may be too high for some side sleepers
  • Limited edge support
Leesa Hybrid
Best Hybrid

Leesa Hybrid

Side sleepers who prefer a hybrid mattress with a balance of comfort and support · Type: Hybrid | Firmness: Medium-firm | Trial: 100 nights

4.1
/ 5

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The Leesa Hybrid features a unique hybrid design that provides excellent support and pressure relief. It is made with eco-friendly materials and has a breathable design. The mattress also comes with a 100-night sleep trial and a 10-year warranty.

What owners report: Owners report that the Leesa Hybrid has greatly improved their sleep quality, citing its ability to alleviate back and joint pain. Some owners have noted that the mattress can be too firm, but this can be remedied with the addition of a topper.

Pros

  • Excellent support
  • Breathable design
  • Eco-friendly materials
Cons

  • Firmness may be too high for some side sleepers
  • Limited edge support

Frequently asked questions

What type of mattress is best for side sleepers?

Side sleepers typically require a mattress with a soft to medium firmness rating, as this provides the necessary pressure relief and contouring to prevent discomfort and pain.

What features should I look for in a king-size mattress for side sleeping?

When looking for a king-size mattress for side sleeping, consider features such as pressure relief, motion transfer, and edge support. Additionally, look for mattresses made with eco-friendly materials and certifications like CertiPUR-US and OEKO-TEX.

How long does it take to break in a new mattress?

The break-in period for a new mattress can vary depending on the type of mattress and the individual's preferences. On average, it can take anywhere from a few days to a few weeks for a mattress to fully break in and provide optimal comfort and support.

Can I return a mattress if I'm not satisfied with it?

Most mattress companies offer a sleep trial period, which allows customers to return or exchange their mattress if they are not satisfied with it. Be sure to review the company's return policy before making a purchase.

What is the difference between a hybrid and memory foam mattress?

Hybrid mattresses combine different materials, such as foam and innerspring coils, to provide a balanced level of comfort and support. Memory foam mattresses, on the other hand, are made from a single type of foam that conforms to the body's shape and provides pressure relief.

The verdict

The WinkBeds Plus is the overall winner, offering a perfect balance of comfort and support for side sleepers. For those on a budget, the Saatva HD is a great alternative, providing excellent value for the price. For side sleepers who tend to sleep hot, the PlushBeds Botanical Bliss is a great option, featuring a unique natural latex design that provides excellent breathability and cooling.

J
James Calder
Sleep & Mattress Editor

James leads mattress and sleep-surface research for MattressVetted. He compares firmness, coil and foam construction, and material certifications (CertiPUR-US) against thousands of aggregated owner reviews. We do not accept payment for placement and we do not physically test products.