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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
250 ratings250 reviews
  1. 5 stars79% (198)
  2. 4 stars15% (38)
  3. 3 stars3% (7)
  4. 2 stars1% (2)
  5. 1 star2% (5)

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Showing 71-80 of 250 reviews
Feb 4, 2026
Reviewer name: Christian Q
5 out of 5 stars
5 out of 5 stars review

Great Product

Comfy and exactly what we were looking for!

Review from Serta
Helpful?1L02F9H4SZMK15235570026
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
Helpful?1L02F9H4SZMK15235570026
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
Helpful?1L02F9H4SZMK15235570026
Sep 19, 2025
Reviewer name: Debbe H
5 out of 5 stars
5 out of 5 stars review

Saved my back

I have a lot of health issues with my back and haven’t been able to find a mattress that is comfortable until now. Thank you so much.

Review from Serta
Helpful?1L02F9H4SZMK15235570026
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?1L02F9H4SZMK15235570026
Nov 23, 2025
Reviewer name: Francis M
5 out of 5 stars
5 out of 5 stars review

Good Mattress

My new Serta mattress is great! I’am sleeping much better now that I have my new mattress! I recommend Serta mattresses.

Review from Serta
Helpful?1L02F9H4SZMK15235570026
Oct 13, 2025
Reviewer name: Barbara E
3 out of 5 stars
3 out of 5 stars review

Adjustable bed

I like the bed but unhappy that I cannot use my head board and it is difficult to keep the top sheet secured.

Review from Serta
Helpful?1L02F9H4SZMK15235570026
May 8, 2026
Reviewer name: Olsi G
5 out of 5 stars
5 out of 5 stars review

Nice

Nice mattress

Review from Serta
Helpful?1L02F9H4SZMK15235570026
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?1L02F9H4SZMK15235570026
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
Helpful?1L02F9H4SZMK15235570026