Best Firm King-Size Mattresses for 2019

For both comfort and support, choose the Modway Kate Firm Innerspring King-Size Mattress and enjoy a good night's sleep. This Modway mattress has an 8-inch thickness, so the mattress will not sag in the middle or collapse on the sides. It is available in a king-size, allowing partners to have plenty of their own sleeping space. It features a polyester cover, which is a strong choice that will retain its shape over the years. It features a firm comfort level, which is ideal for those who enjoy sleeping on their sides.

This Modway mattress has a quilted cover, providing added comfort and cushioning. It features an innerspring construction, adapting easily to your sleeping position. It is designed with individually-wrapped pocket coils to promote airflow for a cooler sleeping surface. It offers pressure point relief so that your spine and joints are well supported to diminish any discomfort. Easy to transport, it adds greater convenience for when moving or rearranging the room.

Ensuring you don't wake up sweating, the Serta Blue Max Touch Firm Gel Memory Foam King-Size Mattress is a cool option to consider if you get overheated at night. With a 12.5-inch thickness, this Serta mattress can sustain a lot of weight so it won't lose its shape over time. Available in a king-size, it ensures that you'll have a generous amount of room to spread out and enjoy a good night's sleep. Providing pressure point relief, it helps to relax sore muscles and joints. It features heat regulation technology, promoting optimal sleep temperature. This Serta mattress features a firm comfort level, so it won't sag easily.

With a gel memory foam construction, this Serta mattress gives off a special plush feel. It includes five layers and features a ventilated design, which will increase its overall lifespan by preventing dust mites and mold. It has a TempActiv touch cover for superior thermal regulation and cooling. This thick mattress is built with infused with active beads foam.

For a good night's rest and endless comfort, choose a Wolf Mattress Firm Hybrid King-Size Mattress. Designed with a hybrid construction, this thick mattress combines the best features of each different mattress type. It features pressure point relief technology, so your body is well supported to diminish any discomfort. This thick mattress has a supportive design, aligning your spine horizontally when sleeping on your side. It is available in a king-size, so you are able to stretch out in your sleep. It has an 11-inch thickness, which provides a lot of foundational support and helps keep it in great shape for longer. With a firm comfort level, it will adapt to the curves of your spine in order to keep your body straight.

Looking for a green and eco-friendly mattress? Consider the Sleep Sync Firm Gel Memory Foam King-Size Mattress. This hypoallergenic mattress eliminates motion transfer, so you won't be awakened by movement. It features a firm comfort level, giving better balance to pressure areas that we stress. Featuring antimicrobial fabric, it fights against any dangerous mildew. Available in a king-size, it ensures that you'll have a generous amount of room to spread out and enjoy a good night's sleep. With a 10-inch thickness, this Sleep Sync mattress will stay in good shape and not sink in even after prolonged use.

This hypoallergenic mattress is made with eco-friendly materials, meaning they are constructed with biodegradable substances. Designed with a gel memory foam construction, this thick mattress gives off a unique plush feel. It has a removable cover, so you can conveniently clean it to ensure a fresh sleeping area. It is built with pressure sensitive foam to help support your sleeping position.

Looking to go the eco-friendly route? Consider the Sleep Sync Firm Memory Foam King-Size Mattress. This thick mattress features a firm comfort level, giving better balance to pressure areas that we stress. It has a 12-inch thickness, which can appear disproportional in some bed frames. With resistance to dust mites, it makes it an ideal choice for people who suffer from allergies. Available in a king-size, it ensures that you'll have a lot of space to spread out and enjoy a good night's sleep.

Designed with a memory foam construction, this Sleep Sync mattress reshapes itself to your body as you move around at night. Featuring three layers, it offers extra firmness on pressure points and greater stability for your back. It has 3 lbs open cell memory foam and GEL LUX synthetic latex foam layers. It is built with antimicrobial fibers, protecting you from toxic bacteria. This Sleep Sync mattress minimizes motion transfer, so you won't be woken up by movement. It is eco-friendly, meaning they are built with biodegradable, natural substances.

For a better night's sleep and endless comfort, opt for a Select Luxury Firm Memory Foam King-Size Mattress. Available in a king-size, this Select Luxury mattress offers plenty of room to stretch out and relax. It features a 14-inch thickness, so after long periods of time it won't sag in the middle. It is designed to eliminate motion transfer, making it perfect for restless sleepers. It features antimicrobial fibers so that it will stay clean and hygienic. It has a firm comfort level, which provides the support needed to keep your body straight. It has a memory foam construction, which allows you to move around in your sleep and then re-contours to your body after you've found a comfortable position. It is resistant to dust mites, so you can sleep easy knowing your mattress is pest-free. It has a zippered cover, making it easy to place on and take off your mattress.

For a better night's rest and endless comfort, select a Select Luxury Firm Memory Foam King-Size Mattress. This thick mattress has a 14-inch thickness, which ensures support for heavier sleepers. With a firm comfort level, it provides complete support of your body for restful and deep sleep. It has antimicrobial benefits, ensuring that your bed is a free of harmful particles and pests. It reduces motion transfer so that any kind of movement won't disturb your sleep. This Select Luxury mattress is available in a king-size, so you have a lot space to sleep comfortably. It features a memory foam construction, which lets you toss and turn and then re-contours to your body after you've found a comfortable position. It features a zippered cover for a secure fit on your mattress. It features a specialized material that is resistant to dust mites, lowering your risk of having allergic reactions.

For a better night's rest and endless comfort, opt for a Priage Firm Euro Top King-Size Mattress. This thick mattress features a firm comfort level, providing the support necessary for spinal alignment. Available in a king-size, it ensures that you'll have a generous amount of room to spread out and enjoy a good night's sleep. It has a 12-inch thickness, which ensures that it will stay in good shape and not sink in even after prolonged use.

Featuring a Euro top construction, this Priage mattress will move or lose its shape because the pillow layer is attached underneath the cover. It is designed with a soft cover and features a jacquard cover, upgrading the overall comfort and support of the mattress due to the extra padding. It has HD foam and support foam layers. It has individually-wrapped pocket coils, so it minimizes pressure points and optimizes comfort. With four layers, it provides you with stability, ultra comfort, resilience, and ultimate softness. This Priage mattress is made to eliminate motion transfer, making it great for light sleepers. It features pressure point relief technology so that any pain is diminished because of essential joint support.

For both comfort and support, choose the Lull Firm Memory Foam King-Size Mattress and enjoy a restful night's sleep. This therapeutic mattress is available in a king-size, giving you the space to stretch out. With a firm comfort level, it requires bones to absorb the most pressure so there is minimal weight on muscles. It features a 10-inch thickness, keeping your mattress functional for years.

Featuring a memory foam construction, this therapeutic mattress reshapes itself to your body if you moved around in your sleep. It features three layers, working together to ensure both comfort and support. It features Visco memory foam and support foam layers. This highly breathable thick mattress promotes airflow to prevent mold from developing. It has a 100 night sleep trial, which means that if it doesn't feel like the perfect mattress for you after that time, you can return it free of charge.

The Simmons Beautyrest Legend McFarland Firm Memory Foam Mattress is a good choice for anyone who gets overheated at night. Providing pressure point relief, this thick mattress works to relax sore muscles and joints. It conforms to the natural curves of your body so that your shoulders and hips will sink more deeply into the mattress, offering optimal spinal alignment. Featuring a memory foam construction, it accommodates every possible sleeping position.

This Simmons mattress features AirCool® foam, comfort foam, DualCool™ Technology memory foam, Dynamic Response™ memory foam, Comfort Response™ latex, and energy foam layers. It is available in a king-size, so you have a lot space to sleep comfortably. With a firm comfort level, it requires bones to absorb the most pressure so there is minimal stress on muscles. It features a 15.3-inch thickness, which can tend to appear too large in some bed frames. It has a dualcool cover, so you'll never be too hot or too cold. It features a ventilated design, so heat and humidity are released to counter mold or mildew.