What to Look for In a King Size Mattress?
Before you buy a king size mattress, it’s important to know what features to look for. Comfort layers relieve pressure in the the spine, neck, and shoulders while zoned support helps maintain spinal alignment. Edge support enhances durability and makes it easier to get out of bed.
A hybrid king size mattress typically includes individually wrapped or pocketed coils that conform to your shape and adapt as you move. Pocketed coils also prevent motion transfer so your partner can sleep undisturbed if you’re tossing and turning.
All of these key features add up to a roomy, comfortable sleep surface. Are you looking for a top king size mattress? Next, we’ll share our recommendation to help you in your search for the best king size mattress.

What Is the Best King Size Mattress?
Our team has researched leading king size mattresses, weighing the key factors. After our research and review, we believe that the Saatva Classic is a top choice in the search for best king size mattress. Read on to learn why we’re impressed with this mattress.
3 Firmness Levels
Once you’ve decided that you want a king size mattress, firmness level is another important consideration. We like that you can choose the firmness level of your Saatva Classic:
- Plush Soft: Extra cushioning gives this option a softer feel. On a firmness scale of 1 to 10, with 10 the firmest, Plush Soft has a rating of 3 or medium soft. It’s a good choice for lightweight or side sleepers who need extra cushioning for the neck, shoulders, and hips.
- Luxury Firm: With a firmness rating of 5-7 or medium firm, Luxury Firm has a similar feel to a luxury hotel mattress. With a balance of cushioning and support, it works for all sleep positions and is a great option for couples with differing firmness preferences.
- Firm: The firm feel gives the impression of sleeping on top of the mattress instead of sinking into it. It maintains spinal alignment and provides needed support for heavier sleepers as well as stomach and back sleepers.
Longlasting
Thanks to the dual-coil system, the Saatva Classic is designed to last. The triple-tempered coils offer responsive support and resist sagging. The layer of pocketed coils is made of durable 14.5-gauge steel, and the innerspring layer is made of 13-gauge steel. Made of recycled carbon steel, the two layers of coils are built to provide consistent support for years to come.
Plush Pillow Top
The plush pillow top is a standard feature that comes with every Saatva Classic mattress. Whether you choose the Plush Soft, Luxury Firm, or Firm option, the 3” Euro pillow top is part of the package. The luxurious layer is specially adapted for each firmness level.
Lumbar Zone Support
The Saatva Classic targets support to the lumbar zone, an area that often needs extra support. First, the Euro top has Lumbar Zone® Quilting for extra lumbar support. Just below the pillow top, the Lumbar Zone® Active Spinal Wire helps keep the spine aligned, and the middle third of the mattress is reinforced to add support where it’s needed most. The layer of pocketed coils is also reinforced to provide extra support to the middle third of the mattress.
Pressure Relief
The Saatva Classic king size mattress cradles your body and relieves pressure as you stretch out. The 3” Euro pillow top provides just enough cushioning and pressure relief for your firmness preference. Next, the high-density memory foam crown relieves pressure points in the spine, neck, and shoulders. The individually wrapped coils conform to your shape for even more pressure relief.
Breathable
Starting with the pillow top cover, the Saatva Classic king size mattress contains breathable materials to help keep you cool. The cover is made of breathable organic cotton and treated with GuardinTM, Saatva’s exclusive botanical antimicrobial treatment. Plus, the dual coil layers promote air circulation to keep you cool and comfortable. Whether you share the Saatva Classic with a spouse or let your pet snuggle up beside you, this king size mattress will stay fresh and cool.
Motion Isolation
A top king size mattress should be designed to promote a sound sleep, even if your partner or spouse moves around or gets out of bed. Couples who are searching for the best king size mattress will appreciate the motion isolation provided by the Saatva Classic. Because the pocketed coils are individually wrapped, they adapt to your every move and prevent motion transfer. In other words, if one partner is tossing and turning, the other partner won’t feel it on their side of the bed.
Hypoallergenic Cover
Even the best king size mattress can be uncomfortable if you’re experiencing allergy symptoms. The Saatva Classic mattress cover is made of hypoallergenic cotton, which is a helpful feature for allergy sufferers. Saatva’s antimicrobial treatment also helps prevent bacteria, mold, and mildew growth.
Edge Support
Solid edge support is important in a king size mattress because it makes getting out of bed easier and prevents sagging. Thanks to the high-density foam rails, the Saatva Classic king size mattress offers excellent edge support. When you sit on the side of the mattress, you won’t feel as though you are sliding off the edge. You will also experience consistent support from one edge of the mattress to the other.
Different Kinds of King Size Mattresses
There are several variations on the king size mattress. Split king and split California king are designed for adjustable beds that have separate controls for each side of the bed. The Saatva Classic mattress is available at 11.5” or 14.5” thick in the following types of king size models:
- King/Split King: 76” x 80”
- Cal King/Split Cal King: 72” x 84”
365-Night Trial
Let’s face it, a luxury king size mattress is a major investment. You want to be sure that it’s the best king size mattress for your sleep needs. But it can take weeks or even months to adjust to a new mattress and know for sure if it’s a good fit.
That’s why we applaud the 365-night trial that comes with the Saatva Classic king size mattress. It gives you an entire year to try the mattress at home, through every season. If you decide the mattress isn’t a good fit, you can return it for a refund it within the trial period. If you prefer, you can exchange the Classic king size mattress for another mattress. Saatva does charge a processing fee for returns and exchanges.
The Best King Size Mattress: Final Thoughts
When you’re looking at top king size mattresses, there are many factors to keep in mind besides mattress size. The right firmness level for your sleep style and personal preference is crucial for a comfortable sleep. Pressure relief and zoned support help maintain proper alignment and help prevent morning aches and stiffness.
We recommend the Saatva Classic mattress as a top pick in the search for best king size mattress. With customizable firmness levels, this luxury hybrid mattress is suitable for all sleep positions. Couples can get a good night’s sleep thanks to the motion isolation provided by the pocketed coils. The spacious surface provides edge-to-edge support and targets extra support to the lumbar area.
We also think you’ll like how the Saatva Classic king size mattress stays cool. The two layers of coils allow airflow to carry away body heat. The hypoallergenic mattress cover is made of breathable material that keeps you cool and comfortable. Plus, the antimicrobial treatment prevents mold and mildew growth.
Along with these top-notch features is a generous trial period. The Saatva Classic comes with a 365-night sleep trial that gives you plenty of time to try your new king size mattress at home.
After researching leading king size mattress brands and models, we believe that the Saatva Classic offers an ideal combination of features. We recommend it as our top pick in the search for the best king size mattress.