Simmons Beautyrest Harmony Lux Carbon Series Extra Firm Mattress

Call for the best deals and expert mattress advice!


Sleep City is one of the largest mattress web dealers in the country specializing in luxury products at the best price. Call 877-246-7533 to speak with our knowledgeable staff to get the best mattress advice in the industry. We will provide you with the best price and service available. We monitor our competition to ensure the best prices in the country.

Simmons Beautyrest Harmony Lux Carbon Series Extra Firm Mattress

The Simmons Beautyrest Harmony Lux Carbon Series Extra Firm Mattress features Simmons newest high-quality materials at an affordable price. The T2 Pocketed Coil support system provides support where you need it most and RightTemp Wave Foam provides incredible pressure relief and draws heat away from your body with the addition of conductive carbon fibers. The Harmony Lux Carbon Series Extra Firm Mattress has a very firm feel that is going to be an ideal choice for stomach and back sleepers who know they like a very firm mattress.

The Simmons Beautyrest Harmony Lux Carbon Series Extra Firm Mattress features Simmons latest innovations in temperature regulation, comfort, support, and sustainability. The new and innovative coil design enhanced pressure-relieving foams, and cooling eco-friendly materials make this collection an exceptional choice for improving your sleep.

Key Features of the Simmons Beautyrest Harmony Lux Carbon Series Extra Firm Mattress:

  • T2 Pocketed Coil – Exclusively made for the Beautyrest Harmony Lux mattresses, These high-carbon steel springs are double strand-wrapped, pre-compressed, and placed into a durable, yet soft non-allergenic fabric individually. These coils are alternately placed with Beautyrest Pocketed Coils in the center of your mattress where most of your weight sits. What that means to you is increased strength, motion separation, and conformability in the center of your mattress creating indulgent comfort and support where you need it most.
  • Beautyrest Pocketed Coil – Beautyrest pocketed coils provide the best conforming properties and pressure relief in the industry. With hundreds of individually wrapped coils, you can sleep comfortably and undisturbed with individualized back support and premium motion separation.
  • Seaqual Fabric Technology – Seaqual Fabric Technology is a sustainable, eco-friendly fabric made from plastics removed from the world’s ocean and transformed into premium new fabrics. Every Simmons Beautyrest Harmony Lux Mattress features this technology. Each queen-size mattress helps recover the equivalent of 50 water bottles from the ocean.
  • InfiniCool Lux- Cool-to-the-Touch technology in the quilt cover keeps you from overheating during the night and an antimicrobial layer featuring silver additives works to keep your mattress fresh and cool by moving heat and moisture away from the surface.
  • RightTemp Wave Foam- Features a wavy surface with peaks and valleys. This foam provides consistent support and enhanced cooling comfort with the addition of carbon fibers that pull heat away from your body.
  • Comfort Foam – Comfort Foam is made in varying levels of softness (extra firm, firm, medium, plush, etc.) to create comfort preferences for all comfort levels.
  • Beautyrest Gel Memory Foam – This is a premium memory foam combined with gel to provide incredible pressure relief and motion separation.
  • BeautyEdge -Each Beautyrest Harmony Lux mattress is surrounded by thick foam rails for an additional firm, stable support around the edge of the mattress. Enjoy sleeping to the very edge of your Beautyrest Black mattress without feeling like you are going to slip or roll out.
  • Triton European Foundation -Supports up to 2,000 lbs of pressure for long-lasting durability.
  • 10-Year Limited Warranty – The best warranty in the business.
  • Adjustable Base Friendly 
Dimensions 12.5 cm

10 Year

Support System

T2 Pocketed Coil Technology, – Coil Counts – Twin – 465, Twin XL – 513, Full – 647, Queen – 825, King – 1051, Cal King – 1117, Split King – 1026, BeautyEdge, 1 ½" Energy Foam


InfiniCool Lux, Seaqual Fabric Technology

Mattress Height


Comfort Layer

1” RightTemp Wave Foam, ½” Firm Comfort Foam, ½” Beautyrest Gel Memory Foam, 1” Firm Comfort Foam


Coupon Code:

Coupon Code: SLEEPCITY
Asset 10

Free Delivery

Every product, everyday! You'll enjoy, stress-free delivery!

Learn More

Asset 11

Love Your Bed Guarantee

Our experts are here to help you every step of the way.

Learn More

Asset 13

Low Price Guarantee

Sleep soundly knowing you can try your mattress in the comfort of your home.

Learn More

Asset 12

No Sales Tax

Up to 72 months with no interest, we've got your perfect financing option.

Learn More