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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
stars232 ratings232 reviews
  1. 5 stars79% (184)
  2. 4 stars16% (36)
  3. 3 stars3% (7)
  4. 2 stars0% (1)
  5. 1 star2% (4)

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Showing 31-40 of 232 reviews
Mar 21, 2026
Cari T
4 out of 5 stars review

Perfect Sleeper

This mattress will be “perfect” as soon as my back adjusts to the firmness. I do like the comfiness of the top layer and the mattress is supportive.

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Mar 27, 2026
Trent W
5 out of 5 stars review

Nice mattress

Firm but not extra firm with some top foam. It's nice!

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Apr 14, 2026
Bill H
5 out of 5 stars review

Knox firm

A few days in. So far so good. Needed firm mattress. Waking up without pain

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Apr 19, 2026
Robert F
4 out of 5 stars review

Not light

So far seems cool im older and had to have help to move it

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Apr 16, 2026
Joseph B
5 out of 5 stars review

First Night Restful

I typically take days to adjust to a new mattress. The first night was very relaxing.

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Apr 24, 2026
Elona C
5 out of 5 stars review

My new bed

My mattress is comfortable and allows a good night rest.

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Apr 12, 2026
Marc G
4 out of 5 stars review

Comfortable

Comfy mattress, I don’t like the blue floral color fabric, only draw back.

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Dec 13, 2025
Linda S
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.

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Dec 25, 2025
Gloria S
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

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Nov 23, 2025
Francis M
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.

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