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Customer reviews for Serta Perfect Sleeper X Knox Hybrid Mattress for
Serta Perfect Sleeper X Knox Hybrid Mattress
4.7 out of 5 stars
stars229 ratings229 reviews
  1. 5 stars79% (181)
  2. 4 stars16% (36)
  3. 3 stars3% (7)
  4. 2 stars0% (1)
  5. 1 star2% (4)

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Showing 91-100 of 229 reviews
Mar 28, 2026
Sarah A
5 out of 5 stars review

Ashley Furniture

Great firm mattress

Review from Serta
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Mar 22, 2026
Alexander M
5 out of 5 stars review

Excellent firm mattress

Very supportive

Review from Serta
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Apr 6, 2026
Marta Z
5 out of 5 stars review

Full size Mattress

Just unwrapped it.

Review from Serta
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Mar 16, 2026
Lisa A
4 out of 5 stars review

Firm

Firm and supportive

Review from Serta
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Jul 17, 2025
Kendra S
4 out of 5 stars review

Sister bed

My sister seems to be comfortable and sleeps well through the night. No more saggy mattress she wakes up with a smile on her face.

Review from Serta
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Aug 11, 2025
Patricia B
3 out of 5 stars review

So so

Seems to stay indented where I sleep. Didn’t think I would have that with such an expensive mattress. But seems to be comfortable.

Review from Serta
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Jun 21, 2025
Erica N
5 out of 5 stars review

Perfect Sleep

Not too firm, not too soft, just right! In love with my new mattress. Highly recommend. It makes a difference!

Review from Serta
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May 28, 2025
Mary T
5 out of 5 stars review

Excellent mattress

I love the Serta Knox firm mattress! Even though it is firm, it is comfortable and I can sleep without any issues.

Review from Serta
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Feb 3, 2026
James L
5 out of 5 stars review

Serta Firm

Very supportive

Review from Serta
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Sep 23, 2024
sarahhhwhite_
5 out of 5 stars review

Best Night’s Sleep

[This review was collected as part of a promotion.] I was so excited to receive this mattress! This is the most comfortable bed that I have slept on. Everything from the cooling technology to the perfect balance of firmness to plush. I’ve never had any discomfort from sleeping and I am a side sleeper. I would recommend this mattress to anyone in the market for something new that has great cooling technology and molds perfectly to make a great nights sleep!

Review from influenster.com
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