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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
stars237 ratings237 reviews
  1. 5 stars79% (188)
  2. 4 stars16% (37)
  3. 3 stars3% (7)
  4. 2 stars0% (1)
  5. 1 star2% (4)

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Showing 1-10 of 237 reviews
Mar 25, 2025
DrJLD
5 out of 5 stars review

Verified Purchase

A Perfect Balance of Comfort and Support!

We absolutely love our Serta mattress! At first, it felt a bit stiff, but after a few days of breaking it in, it became incredibly comfortable. We made the switch from our previous pillow top options because they kept breaking down too quickly, and we're so pleased with our decision. This mattress provides great support and feels much more durable. Overall, we couldn’t be happier with our purchase!

Review from Serta
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Jun 7, 2026
Telisa S
5 out of 5 stars review

So far so good!

My first night sleeping on the mattress and it was night and day compared to my old mattress. I did not wake up in pain, specifically, low back pain. The difference after one night of sleep is profound. I pray this continues and does not change after a year. It seems that’s when mattresses sleep quality change.

Review from Serta
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Jan 1, 2025
CaseyAZ
5 out of 5 stars review

Verified Purchase

Supportive mattresse

Have been sleeping on the mattress for about 3 weeks. Me and my partner like different firmnesses. I am a side sleepersnd they are side and back sleeper. We got the medium firm with a pillow top and it comfortable for both of us. JE

Review from Serta
Helpful?7JIQY3DE2VJ715234813404
Mar 9, 2026
Carin Z
5 out of 5 stars review

Best Night Sleep Period.

When the mattress arrived it was just great, no weird smell and looked exactly like the showroom model. It's very firm which helped my herniated disc. I work hard and I need to recharge at night, not toss and turn. It's perfect for me and I'm glad I chose this one. The design and color are also very attractive to the eye. One of the best features of my purchase was the mattress protector with cooling technology. It's in there! I slept well and could notice the difference in temperature immediately. I highly recommend.

Review from Serta
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Apr 18, 2026
Xenia D
5 out of 5 stars review

Just right

I was unsure about ordering a comforter online that I didn't get to test first. Luckily it worked out providing the support and softness that I wanted.

Review from Serta
Helpful?7JIQY3DE2VJ715234813404
Nov 23, 2024
Holli
5 out of 5 stars review

Verified Purchase

Great mattress

This mattress is amazing and a life saver. I did expect it to be more plush but it's still very comfortable. I sleep great now!

Review from Serta
Helpful?7JIQY3DE2VJ715234813404
Jun 9, 2026
Keith B
4 out of 5 stars review

Sleepless Nights

My 4 star is more for great price for mattress. I've only had 3 nights of sleep with my new mattress and not able to give a true performance review for the comfort of the mattress. What I can give, I have not awaken during the night or next morning with total body soreness.

Review from Serta
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Jul 28, 2025
Johnny
4 out of 5 stars review

plush is medium firm to firm.

i bought what was described as a plush mattress and I would not describe it as plush. i would call it medium firm to firm. the mattress is of high quality, imo, just the description does not match firmness of the mattress. i woke up to body aches, being a side sleeper. after giving the mattress a month, i finally added a 2 inch memory foam topper. now, i sleep comfortably.

Helpful?7JIQY3DE2VJ715234813404
Mar 17, 2026
Nicole R
4 out of 5 stars review

Nice firm mattress

We replaced a failing mattress with this Serta Hybrid... it nicely firm and supportive, but not overly hard. It sits a little higher up than previous mattresses (maybe due to the matching foundation?) but my tall husband appreciates the extra height.

Review from Serta
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Apr 11, 2026
Emily M
2 out of 5 stars review

Horrible

2 1/2 months in and my husband and I still haven’t adjusted to this mattress. It does not have a cooling effect whatsoever, in fact it holds heat. We both wake up with back pain. Now we’re stuck with it and stuck with poor quality sleep. If you’re looking for a new mattress, don’t buy this one.

Review from Serta
Helpful?7JIQY3DE2VJ715234813404