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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
stars229 ratings229 reviews
  1. 5 stars79% (181)
  2. 4 stars16% (36)
  3. 3 stars3% (7)
  4. 2 stars0% (1)
  5. 1 star2% (4)

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Showing 91-100 of 229 reviews
May 28, 2025
Mary T
5 out of 5 stars review

Excellent mattress

I love the Serta Knox firm mattress! Even though it is firm, it is comfortable and I can sleep without any issues.

Review from Serta
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Jun 21, 2025
Erica N
5 out of 5 stars review

Perfect Sleep

Not too firm, not too soft, just right! In love with my new mattress. Highly recommend. It makes a difference!

Review from Serta
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Jul 17, 2025
Kendra S
4 out of 5 stars review

Sister bed

My sister seems to be comfortable and sleeps well through the night. No more saggy mattress she wakes up with a smile on her face.

Review from Serta
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Mar 16, 2026
Lisa A
4 out of 5 stars review

Firm

Firm and supportive

Review from Serta
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Feb 3, 2026
James L
5 out of 5 stars review

Serta Firm

Very supportive

Review from Serta
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Sep 23, 2024
sarahhhwhite_
5 out of 5 stars review

Best Night’s Sleep

[This review was collected as part of a promotion.] I was so excited to receive this mattress! This is the most comfortable bed that I have slept on. Everything from the cooling technology to the perfect balance of firmness to plush. I’ve never had any discomfort from sleeping and I am a side sleeper. I would recommend this mattress to anyone in the market for something new that has great cooling technology and molds perfectly to make a great nights sleep!

Review from influenster.com
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Sep 28, 2024
victoriar367
5 out of 5 stars review

Comfortable

[This review was collected as part of a promotion.] ABSOLUTELY AMAZING! I can't believe I received a mattress, an extremely comfortable one at that! It adds so much to the room. The height is great & completes the room. The design on the mattress is very intricate. Good support, durability, and comfort. It's soft yet firm. Love this mattress!

Review from influenster.com
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Oct 22, 2024
photoginthewild
5 out of 5 stars review

Sleep Cool and Comfortable

[This review was collected as part of a promotion.] I have spent a full month sleeping on this mattress. I love it! I am a bit of a princess and a pea when it comes to mattresses. Most importantly for me, I am a woman who wakes up hot in the middle of the night. Not sweaty but just hot, not in a snuggly way but an uncomfortable way. I have not had that issue at all with this mattress. It conforms and cradles your curves if you are a side sleeper and it is a very tall mattress which I like. For reference, my previous mattress was a tempurpedic so I was worried about it being too soft but while the top is thick and plus, it has plenty of support. Very pleased with this mattress!

Review from influenster.com
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Sep 27, 2024
rebandwrath
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.

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Sep 26, 2024
joelleli
5 out of 5 stars review

My son loves it

[This review was collected as part of a promotion.] We put this serta mattress in my son's room and he loves sleeping in it. It's really comfortable for us as well for those nights he wants us sleeping with him. My husband and I don't wake with any back pain like we did with his old mattress. 10/10 would recommend

Review from influenster.com
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