Harmony Lux Carbon Extra FirmHarmony Lux Carbon Extra Firm

Beautyrest® Harmony Lux Carbon Extra Firm

(14 customer reviews)


Sleep Master Canada

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Size Guide

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Single XL: 39″ x 80″ x 12″
Double: 54” x 74” x 12″
Queen: 60” x 80” x 12″
King: 76” x 80” x 12″

Product Features

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The brand new Beautyrest Harmony Lux Carbon Series Extra Firm mattress available at Sleep Masters Canada. With the all new design, here are some of the key new features:

  • Cool Sleep – The new INFINICOOL LUX technology provides a cool sleep surface throughout the night ensuring that you fall and stay asleep
  • Consistent Pressure Relief – The combination of RIGHTTEMP wave foam, BEAUTYREST gel foam and FIRM comfort foam provides an ultra-strong, highly conductive and supportive feel night after night
  • Precision Support System – The use of T2 Pocketed Coil technology features a dual-stranded coil for additional support in the long run.


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This mattress is only available in the Greater Toronto Area. Shipping is free with a turnaround time of 7-10 business days. 

14 reviews for Beautyrest® Harmony Lux Carbon Extra Firm

  1. Par S.

    I purchased this mattress from sleep masters online without testing it out in person so I was a little worried at first but now I know I made an excellent choice. This was exactly what I was looking for, so happy with it.

  2. Emilia

    Honestly the best firm mattress I have ever had

  3. Janice & Chris

    We are sleeping like a baby every night! So comfortable and I would certainly purchase again and again. Hopefully it keeps it’s shape for a long time!

  4. Rosy C.

    I love it! If you also like an extra firm mattress you will love it too! Highly recommend.

  5. Justin

    This mattress i just perfect for me. I wanted a high quality firm mattress but for it still to be comfortable. This mattress does it all for me!

  6. Leila

    Very happy with this mattress. I have been using it for 3 months now and so far no problems at all!

  7. Quyen

    Really good quality mattress and the service was also great. Will continue to order from Sleep Masters Canada.

  8. Paris

    The best sleep I have ever had. I am a slightly heavier person and I love firm mattresses. This is the best one I have had yet.

  9. Katrina

    I love extra firm mattresses and this is the best extra firm mattress I have owned.

  10. Rhonda

    Purchased this mattress for my daughter and she loves it so much!

  11. Christine

    This is AMAZING. I never thought how much changing our mattress would change our lives. We are both getting undisturbed sleep and we are not rolling towards eachother. So nice and firm which feels great on my back too.

  12. Hee K.

    Firm but comfortable at the same time. Just what I was looking for.

  13. Angela

    A great nights sleep every night, I am really impressed.

  14. Frances

    IF you like a firmer mattress, you are going to love this mattress SO much! It just feels amazing!

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