The 9 Best California King Mattresses Of 2023

Full transparency: This is not the most sustainable option on the market; however, it's an optimal option for those who want maximum support. The innerspring base provides support and allows for airflow, while layers of poly memory foam add much-needed pressure relief. 

Designed to accommodate side sleepers, it's worth noting that some of the reviewers felt it didn't offer enough cushioning. However, a cooling cover and reinforced sides still make this popular pick worth considering, especially for those needing a firmer option.

Side sleepers need to prioritize mattresses that offer cushioning at the hip joint, and this hybrid mattress does just that. It pairs a layer of durable coils with seven layers of gel, making the mattress both soft and supportive. Bonus: There's even reinforced edge support to prevent unwanted slipping off the sides.

While the gel-polymer-infused foam layer almost earned this mattress the top spot for keeping you cool, the layer of contouring transition foam ultimately landed this 12-inch pick a top spot for side sleepers.

Not only is this Avocado mattress the very best pick for the environment on our list, but it also feels great to snooze on. Firmer than other mattress types, it's made with a GOLS organic certified natural latex that contours to your body. Known for its sustainability, the material manages to offer just the right amount of bounce while still maintaining a firm feel.

A greener pick than memory foam, latex also better holds its shape and is fully biodegradable—but it's also pricey. A California king from Avocado will set you back nearly $4,000, but it's a sound investment for those wanting to snooze in peace.

If you and your partner require something completely different from your bed—they're a back sleeper and you snooze firmly on your side—then Saatva's adjustable mattress is the ultimate match. Although more expensive than other options, the luxurious pick offers 50 different firmness options.

Use the hidden inflator button to inflate (or deflate) the air chambers located in the top layer to reach the desired firmness. When paired with six layers of CertiPUR-US® certified foams, you get the ultimate oasis for snoozing. Plus, the split designs can even be used with an adjustable base for the ultimate customization.

With three zones of support, this is the perfect choice for those who want to prioritize their spinal alignment. The foam around the hips is firmer, while the foam at the shoulders is much softer. As a result, it's a great option for back sleepers. Plus, it's recommended by Consumer Reports, which is a testament to the fast and responsive customer service offered by the brand.

While memory foam isn't the best for the environment, Casper has done everything possible to make sure it's causing the least harm. This includes the fact that all foams are low VOC and CertiPUR-US® certified, which means that they don't include any ozone-harming phthalates.

Equal parts supportive and plush, this mattress is the closest thing you'll find to a luxurious hotel-bed feel. It pairs a layer of individually wrapped innerspring coils with a gel-infused foam pillow top available in a variety of firmness options. This allows you to choose the firmness that's best tailored to your needs, whether you're a back, stomach, or side sleeper.

While the brand doesn't stand out on the sustainability front—you won't find any special credentials listed on the site—it does have stellar customer reviews. If you're not a fan, the 120-night trial will be a standout; if you are a fan, you'll be grateful for the lifetime warranty. Better yet, it was also one of our standout picks for the best mattresses for hip pain and low-back pain.

Unlike typical memory foam, this mattress is made with Nolah's proprietary AirFoam, which consists of 100% temperature-neutral materials. Not only will you stay cool, but tiny air bubbles integrated into the foam better distribute body weight to prevent a deep-sinking feeling on heavier limbs.

Optimal for side sleepers, it's made with four layers of the foam, which retain their shape over time. And at 85 pounds, it's also by far the lightest mattress option on this list.

Sometimes you think a mattress is the perfect fit—and then you realize it may be causing you aches or pains. Nest has you covered; the brand will send you additional foam layers to help adjust the firmness of the mattress to suit your sleep preferences. Plus, it'll also send you a new mattress when this one wears out.

The hybrid option uses both memory foam and coils, which means it offers optimal motion isolation. Another perk? All foams are CertiPUR-US® and allowed time to air out in the factory, which limits off-gassing in your home.

You won't find any other mattress quite like this Purple pick—and it's all due to the brand's proprietary GelFlex grid. The unique grid layer has open squares that allow maximum airflow, keeping the Plus mattress cool despite its primarily memory foam makeup. 

Both adaptive and supportive, it features a solid dense foam base layered with premium comfort foam under the grid. This gives a medium-firm feel with plenty of cushioning and pressure relief, although it has less support than the brand's hybrid model. 

You'll have 100 nights to decide whether the Plus is right for you, but if the reviews are any indication, you'll also be impressed. More than 31,000 shoppers have reviewed this cooling mattress, yet it's still earned a solid 4.4 out of 5 stars.