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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
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
Helpful?5QG9W3640AJR15235568831
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?5QG9W3640AJR15235568831
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
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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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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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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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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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Nov 21, 2024
Reviewer name: kaifou_199126
5 out of 5 stars
5 out of 5 stars review

Have you ever wanted your bed to give you a hug?

[This review was collected as part of a promotion.] This bed was put into our guest room and it might be more comfortable than my bed. With the right mattress protector, the mattress is surprisingly cooling and cozy in both hot and cold weather! The mattress has the perfect balance of plushness and support for your body. I would recommend to anyone looking for a new mattress.

Review from Serta
Helpful?5QG9W3640AJR15235568831
Sep 12, 2024
Reviewer name: jordanjd
5 out of 5 stars
5 out of 5 stars review

Better sleep and comforting! Great for my back.

[This review was collected as part of a promotion.] This mattress has been a huge help to the quality of sleep that my wife & I get. Before we had a firm memory foam mattress & it was causing some morning discomfort for both of us. After receiving this mattress it took a week or so to break it in but we have both been sleeping so much better & having little to no discomfort in the mornings. I will say it’s a bit too stiff to sleep on your side with but other than that it’s a great mattress overall. Great material & quality which makes me hopeful it’ll last many years.

Review from Serta
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Sep 27, 2024
Reviewer name: rebandwrath
5 out of 5 stars
5 out of 5 stars review

Perfect

[This review was collected as part of a promotion.] The most comfortable bed I have ever slept on in my life. It’s cooling too so it’s perfect for the summer when it’s too hot to sleep. Breathes easy and supports my body weight and heavy dogs with me.

Review from Serta
Helpful?5QG9W3640AJR15235568831