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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 1-10 of 229 reviews
Mar 8, 2026
dimpelss
5 out of 5 stars review

Get it

I waited to write my review. We've own our mattresses maybe a mo now and it's broken in to my liking perhaps not all the way though. Off hand it was a lil firmer than i would like. I got the plush and the other is the firm both in twin xl's. Ours is paired with an adjustable base in zero clearance status and king size bed. I have moments where i can't wait to get in bed. I thought with my ailments it would help a lil more but mine are mechanical. No matter what i choose the ailments will still be there. When i can sleep it's comfortable. I first tried this in the mattress store along with the kendall model which is just flat and more contouring because of the memory foam. However that model made it harder for me to get up although i loved everything else about it. I got a great deal with the sale price of $799 for each one plus $300 back in gc form which i received appox a wk or so after delivery. I knew what i was getting and didn't go in blind when purchasing. Although i use it with my base there are no dips or anything forming in the mattress. I wish it longevity of 12 yrs as my king koil mattress. It's worth the spend.

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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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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
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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
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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.

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Apr 4, 2026
Linda F
5 out of 5 stars review

Had a full nites sleep!

Wanted firm. Got firm. Kept firm didnt sink in... I slept 12 hours straight instead of adjusting & waking up every 2 hours and woke up with zero aches & pains! Its night #4... im hoping it will last days weeks months & years to come ?

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Apr 19, 2025
CA2025
5 out of 5 stars review

Verified Purchase

GREAT MATRESS !!

Perfect firmness for both my wife and my needs. Slept like I didn't have kids waking me up every few hours again.

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.

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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.

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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
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