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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
stars
264 ratings264 reviews
  1. 5 stars79% (208)
  2. 4 stars15% (40)
  3. 3 stars3% (9)
  4. 2 stars1% (2)
  5. 1 star2% (5)
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Showing 71-80 of 264 reviews
Jan 10, 2026
Reviewer name: Henry D
5 out of 5 stars
5 out of 5 stars review

So far only 2 nights in

So far so good. Went from queen to king. Plenty of room now for the 2 of us. Seems to be doing it's job.

Review from Serta
Helpful?5QG9W3640AJR15234813409
Dec 25, 2025
Reviewer name: Gloria S
5 out of 5 stars
5 out of 5 stars review

serta perfect sleeper x Knox 13.5

The mattress is super firm and comfortable. I am happy. I recommend for people who have joint bone problems and especially the back

Review from Serta
Helpful?5QG9W3640AJR15234813409
Dec 13, 2025
Reviewer name: Linda S
1 out of 5 stars
1 out of 5 stars review

Sink hole

When I first got this replacement, it was great, and now, for the last four months I've been dealing with a sink hole and is killing my lower back.

Review from Serta
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Aug 2, 2026
Reviewer name: Benjamin K
5 out of 5 stars
5 out of 5 stars review

comfy

very comfortable

Review from Serta
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Jun 29, 2026
Reviewer name: Linda C
5 out of 5 stars
5 out of 5 stars review

Serta

Foundation too high.

Review from Serta
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Jul 8, 2026
Reviewer name: John O
5 out of 5 stars
5 out of 5 stars review

Great deal

Very very comfortable

Review from Serta
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Jul 25, 2026
Reviewer name: Joseph T
4 out of 5 stars
4 out of 5 stars review

Very comfortable mattress

Nice supportive mattress

Review from Serta
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Sep 7, 2024
Reviewer name: nestaziak
5 out of 5 stars
5 out of 5 stars review

Best sleep I’ve had in a long time!

[This review was collected as part of a promotion.] This mattress is amazing! I didn’t know how badly I needed a new mattress until I received this one. I had the best nights sleep ever, I woke up feeling refreshed and ready to go for my day! The mattress itself is so comfortable and has just the right amount of firmness. I also like the quilted material of the mattress and the height of it. It is definitely worth the price and I am so happy to have it.

Review from Serta
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Sep 9, 2024
Reviewer name: bbyjayy
5 out of 5 stars
5 out of 5 stars review

Definitely LOVE!!!

[This review was collected as part of a promotion.] At first I was skeptical to receive a mattress to review however I am truly blown away by the quality and comfortability! I went from total memory foam to this and it has truly made a different in the support on my back! I can also tell the different with their cooling technology! I feel blessed and extremely grateful for this opportunity!

Review from Serta
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Sep 25, 2024
Reviewer name: aur0raxxborealis_8663
5 out of 5 stars
5 out of 5 stars review

Firm and hefty!

[This review was collected as part of a promotion.] The Perfect SIeeper Quilted Hybrid was aesthetically, a very clean beautiful mattress with quite a bit of thickness and heft, which made setting it up a bit challenging without assistance. The weight does add to the sense of durability and sturdiness. I was pleasantly surprised to find no odor, which is often an issue with newer mattresses. Most notably though, the mattress is quite firm, which is the style I selected. It's exactly as advertised, very firm. There is little cushion or give but provides great support. I would not recommend this mattress if someone wants to "sleep on a cloud" but rather, would be ideal for those needing extra back support. For anyone looking for a firm mattress that feels built to last, this one would be a great choice.

Review from Serta
Helpful?5QG9W3640AJR15234813409