Firmness & Sleep position


  • Firm
  • Medium
  • Soft
  • Ultra firm
  • Ultra soft
Soft Graphic

Sleeping position

  • Back and Front
  • Multiple
  • Side
Multiple Graphic


The Beautyrest Harmony Lux Diamond Immortal Medium Pillow Top Mattress features new innovations in support, comfort, and cooling working together in harmony to unlock your best sleep. This mattress is idea for side sleepers. It is 17″ thick. Also, you’ll have a cool, comfortable sleep thanks to the Infinicool lux technology. For instance, this technology provides a cool sleep environment, including a cool-to-the-touch sleep surface, to help you fall asleep and stay asleep.

The Beautyrest Harmony Lux Diamond Immortal Medium Pillow Top Mattress has Advanced Pressure Relief. Additionally, Surfacetouch Gel Memory Foam is located directly within the quilted sleep surface and unlocks immediate, advanced pressure relief. Beautyrest uses RightTemp Wave Foam which features ultra-strong, highly conductive carbon fibres for a consistently supportive feel and cool sleep, night after night.

Microdiamond memory foam features actual diamond particles infused in a premium memory foam. This helps conduct heat away from the body.

Beautyrest has also expanded their partnership with SEAQUAL™ to offer their unique sustainable fabric technologies within each Beautyrest Harmony mattress. Seaqual is a leader in ocean plastic recovery and upcycling efforts, and together this partnership will help promote cleaner oceans with every mattress sold.

As well, it is adjustable base friendly.

Simmons/ Beautyrest is proud to provide better sleep around the world in more than 100 countries since 1870.

As Beautyrest says “You Earned a First Class Sleep!”

Enjoy our 10 Year Warranty.

— — —

Looking for more information, but not sure where to start? Simply contact one of our sleep experts, or browse through our other Simmons mattresses. In addition, take our Sleep Quiz to find the perfect mattress.

Discover Beautyrest

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Product Specs & Features

  • Infinicool Lux Technology
  • Advanced Pressure Relief
  • Surfacetouch Gel Memory Foam
  • Righttemp Wave Foam
  • Airfeel Foam
  • Exclusive Beautytech Gel Foam
  • Microdiamond Memory Foam
  • Exclusive Beautytech Gel Foam
  • Precision Support System
  • Powered by T2 Pocketed Coil Technology
  • Dual-stranded coil design
  • 17″ thick

Comfort exchange

As your sleep experts, we want to ensure your mattress is as comfortable and supportive as possible for years to come which is why we offer a 60-day comfort trial with your purchase. If you’re not fully satisfied with your selection, simply arrange to come back in-store within 60 days to choose a new mattress at an equal or greater value, hassle-free. Contact us for details.

We allow one exchange per customer. A minimum $65 fee for delivery is applicable for the exchange.


We strive to make the process of purchasing a new mattress as smooth as possible. For purchases made in one of our Locations, If you purchase a mattress or mattress set valued at over $499, we’ll deliver it absolutely free of charge within the greater Vancouver area. For a fee, we can arrange delivery to Squamish, Whistler, and Chilliwack. For any online purchases made, we’ll deliver them absolutely free of charge within the greater Vancouver area. For all online orders to be shipped outside of British Columbia, please contact us for a shipping quote or any other details. Before you know it, you’ll be having the sleep of your dreams.

Reviews (1)

1 review for Beautyrest Harmony Lux Diamond Immortal Mattress

  1. 5 out of 5


    Awesome mattress ! couldn’t be more happy with the service and pricing sleep shop was able to provide would definitely highly recommend 👍🏻👍🏻👍🏻

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