Extra Firm Mattress in a Box King Mattresses

10", King

Offering the best of both worlds, this hybrid mattress combines conforming, extra firm high-density foam and pocket spring coils to cradle your body in every position, reducing motion transfer and relieving pressure points for a full, undisturbed sleep. You'll wake up each morning feeling refreshed and ready to take on the day. It's compatible with trundle beds, platform beds, and adjustable bed frames. The CertiPUR-US Certified foam is free from harmful substances to ensure a safe sleep environment, allowing you to rest peacefully and relaxed knowing the quality of your indoor air won't be compromised. Your mattress in a box ships compressed, rolled, and boxed, making it easy to transport and fit neatly into most bedframes.

Very comfortable. As described. Rachel. Ambler, PA. Tue Apr 29 2025

King

The flippable Plank Luxe is designed to be the firmest mattress on the market—pairing all of the benefits of the original Plank with the additional responsiveness and pressure point relief of individually encased coils. Put simply, the construction of the Plank Luxe creates a more comfortable sleep surface for both sleep partners. Both the firm and extra-firm sides are offered with optional cooling panels for the ultimate sleep experience.

I love my mattress! It’s extra firm as advertised. Perfect. My back, stomach and sides thank you. Whitney. West Bloomfield, MI. Tue May 20 2025

King

Experience superior support with our premium hybrid mattress, expertly engineered for those who prefer an extra-firm sleep surface. The advanced high-density pocketed coil system provides targeted pressure relief and optimal spinal alignment, specifically contouring to your back, hips, and shoulders. Reinforced edge support with high-resilience foam prevents roll-off and maintains stability, whether you're sleeping or sitting on the mattress edge. Enjoy undisturbed rest with motion-isolating technology that keeps you properly supported all night long—wake up refreshed without aches or pressure points.

King

This dual-sided ultra-firm mattress allows you to choose between the firmest sleep experience available—or a medium-firm sleep experience. The choice is yours with just a flip of your mattress. This sleep surface is inspired by the minimalist approach to sleep found in places like East Asia, while including a more modern mattress design. Enjoy relief from back pain with a sleep surface that helps you achieve a neutral spine while also aiding proper blood circulation and better oxygen intake. The firmest mattress available, guaranteed. (Available with an optional sewn-on cooling cover from high-tech PE fibres.)

Great mattress, firm, comfortable, exactly what I was hoping for. Shirley. Richmond Hill, ON. Sun Mar 16 2025

King

The flippable Plank Luxe is designed to be the firmest mattress on the market—pairing all of the benefits of the original Plank with the additional responsiveness and pressure point relief of individually encased coils. Put simply, the construction of the Plank Luxe creates a more comfortable sleep surface for both sleep partners. Both the firm and extra-firm sides are offered with optional cooling panels for the ultimate sleep experience.

The ability to flip the mattress and have an extra firm side is what sold us on the mattress. The softer side is still firm with a little give.. Chelsea. Seattle, WA. Tue Aug 15 2023

King

Engineered to accommodate heavier sleepers and those who seek extra firm comfort, the LuuF Max offers the support of extra firm Serene Comfort Foam atop a 5-zoned individually wrapped Quantum Coil with increased edge support.

This mattress is amazing! It is actually firm, unlike other mattresses when they say they’re firm but really are not. Absolutely love it. Hi g Lu recommend.. Blerta. Fort Bragg, NC. Mon Mar 10 2025