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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?5QG9W3640AJR15241662248
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?5QG9W3640AJR15241662248
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 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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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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Sep 15, 2024
Reviewer name: ad116
5 out of 5 stars
5 out of 5 stars review

Great night sleep on this firm, pleasant cooling effect, high quality material and beautiful design pattern

[This review was collected as part of a promotion.] Great mattress! I was very excited to finally get a new mattress and I had such a great night of sleep after sleeping on this Serta one. My previous mattress was softer, and I had been waking up with some back pain, but this mattress is firm and helps a lot with my back and hips not sinking in as I sleep. It has a pleasant cooling effect so I didn’t feel overheated at night, and I love that it’s thicker as I like to sleep higher up off the ground since I am tall. It was such a shame to have to cover up the mattress with my bedding as I loved the design and dark blue and white color patterns. It also has helpful handles on the side so you can adjust it as needed on your bedframe. It’s on the heavier side, but most of my mattresses in the past have been heavy as well so I didn’t mind that. I prefer a heavier mattress, so it feels more sturdy when I am on the bed. I would definitely recommend this to anyone looking for a firmer high quality mattress!  

Review from Serta
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May 20, 2025
Reviewer name: Susan T
5 out of 5 stars
5 out of 5 stars review

The best sleep in years

I had my other mattress for 15 years, and it was great until the last week. I knew I had to replace it. I went to Mattress Peddler as I had been there when friends mattress shopping and was impressed with the professionalism and kindness of the owner. I love the mattress I purchased. Just the right firmness. I am so happy

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?5QG9W3640AJR15241662248