The 5 Leading California King Mattresses with the Best Performance

The Naturepedic EOS Classic Organic is a Hybrid latex and coil mattress engineered to provide improved support without compromising on sleepers' comfort. The mattress is crafted from organic and sustainable materials making it a great fit for environmentally conscious sleepers.

What's special about the mattress is that it comes in five firmness levels of Plush, Medium, Cushion-Firm, Firm and Extra Firm with the latter two being more supportive and, therefore, suitable for plus-size sleepers. Equally important, the Queen, King, and California King sizes are sold split enabling you and your partner to customize the mattress feel in case you have different weights and preferences.

The latex and coils the EOS Classic Organic is built from make it a great choice for sleepers who like a bouncy feel. These materials also enable easy repositioning, reduce heat retention, keep the edges highly stable and, as mentioned above, make the mattress eco-friendly. On the whole, the EOS Classic Organic isn't cheap, but taking its numerous advantages into account, it's definitely worth your money.

The mattress is shipped for free in the lower 48 U.S. states. Its comes with a 100-night trial and 25-year prorated warranty.

As it name suggests, the Bear Elite Hybrid is Bear's most advanced mattress exhibiting excellent performances in almost all aspects. This foam and coils hybrid mattress combines improved support and pressure relieving contouring. Its designed to enable ease of movement, provide a cool sleeping environment and facilitate body recovery. 

Similar to the Naturepedic EOS Classic Organic, the Bear Elite Hybrid is available in different firmness options. Sleepers can choose to buy a more conforming Soft model, a solid Firm model or a Medium model, which offers an intermediate feel of contouring and support. 

The Elite Hybrid has a highly advanced coil system which is reinforced in the center for better lumbar support. This system is supplemented by a secondary set of low gauge coils around the perimeter to strengthen the edges. This configuration enables heavier sleepers to opt for their preferred California King size without necessarily choosing the firm model as they'll be sufficiently supported by the Medium model. It becomes crucial if their partner requires a more contouring mattress.

The Bear Elite Hybrid's cover consists of a soft phase-change-material fabric which effectively absorbs and dissipates body heat. Together with copper infused memory foam in the comfort layer, the mattress has high capacity for temperature regulation.The cover also contains Celient fabric. This fabric is designed to convert body heat into infrared energy, which is reflected back at the sleeper soothing the muscles and rejuvenating the body.

The Bear Elite Hybrid is shipped for free within the contiguous USA. It's sold with a 120-night trial and, the icing on the cake, a lifetime warranty.

The Hope Advanced Original is a high-quality all-foam mattress. It's sold at an affordable price allowing buyers to upgrade their sleep experience without putting a heavy burden on their budget. The mattress is distinguished by its smart design comprised of a blend of soft and hard foam, which creates a sound balance of contouring and support.

The Advanced Original has two upper layers of slow responding memory foam which perfectly molds to the shape of sleepers' body giving a pleasant melting-into-the-bed sensation and enabling effective pressure relief. At the same time, two bottom layers of medium density and hardened high density poly foam avert excess sinkage preventing sleepers' spine from being thrown out of its natural alignment.

Those who purchase the Advanced Original California King size mattress will benefit not only from enhanced comfort and strong support, but also from quiet nights on account of the improved ability of the memory foam layers to impede motion transfer. What is more, these layers contain gel which significantly reduces heat retention promising sleepers cool nights.

The Advanced Original is shipped to any destination within the conterminous United States at no additional cost. It comes with a 120-night trial, and, like the Bear Elite Hybrid, it's backed by a a lifetime warranty.

The Amerisleep AS2 is another recommended all-foam mattress. It's highly supportive and relatively inexpensive. Therefore, it's a good fit for plus-size sleepers who are interested in saving money while opting for a larger mattress which scores high in the main parameters.

The AS2 may be too firm for side sleepers who require a more contouring mattress to cradle the sensitive areas in their body, the hips and shoulders in particular. Yet it's ideal for average and heavyweight back and stomach sleepers. It has an ultra-conforming 10 ILD memory foam-based comfort layer, which enables pressure relieving sinkage. At the same time, a transition layer of highly dense poly foam (40 ILD) and a support layer of dense poly foam (35 ILD) counter this sinkage keeping sleepers 'on' the mattress instead of 'in' it.

The transition layer does more than that. It applies Surface Modification Technology creating five support zones across the mattress, which target specific areas in the body optimizing every sleeping position.

Equally important, the AS2 is engineered to prevent over-heating, which is highly beneficial for XL people who tend to sleep hot because of their massive body. Its memory foam has open cell structure allowing cooling air to fill the gaps between the cells. The poly foam in the transition layer is convoluted and is, therefore, more breathable than other types of foam.

The AS2 is shipped for free inside the continental USA. It's sold with a 100-night trial and a 20-year prorated warranty.

The Avocado Green is a latex and coils hybrid mattress. It's the right choice for sleepers who care about preserving the environment as all its ingredients are natural and organic. Even the coils are manufactured from recycled steel. In addition to being eco-friendly, the mattress offers improved zoned support, ease of movement and effective heat dissipation.

The Avocado Green's larger sizes, the King and the California King, contain more than 1,400 individually encased coils rendering these mattresses highly supportive for sleepers who weigh more than 150 pounds. These coils have three different gauges, and they're arranged in 5 distinct ergonomic support zones elevating sleepers body and keeping their back properly aligned. One of the zones supported by the coils is the perimeter. That makes the edges highly stable allowing sleepers to lie away from the center and, thus, utilize the entire surface of the mattress.

The Avocado Green is also very comfortable. Its top layer of 2'' responsive Dunlop latex provides pressure reliving bounce. Sleepers may also choose to buy an additional 2'' pillow top made of elastic latex to give the mattress a plush feel and make it cozier. This pillow top is highly recommended to side sleepers who need a softer surface to avert pressure.

People who sleep hot will highly benefit from the Avocado Green's low heat retention. The mattress' cover consists of breathable cotton and wool, which wick away warm air and moisture. The latex has perforated structure and together with the coils, it facilitates air circulation aiding in the cooling process.

The Avocado Green is shipped to any place within the contiguous USA at no cost. It comes with a long 365-night trial and a 25-year prorated warranty.