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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
264 ratings264 reviews
  1. 5 stars79% (208)
  2. 4 stars15% (40)
  3. 3 stars3% (9)
  4. 2 stars1% (2)
  5. 1 star2% (5)
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Showing 131-140 of 264 reviews
Mar 22, 2026
Reviewer name: Alexander M
5 out of 5 stars
5 out of 5 stars review

Excellent firm mattress

Very supportive

Review from Serta
Helpful?5QG9W3640AJR15234813404
Mar 16, 2026
Reviewer name: Lisa A
4 out of 5 stars
4 out of 5 stars review

Firm

Firm and supportive

Review from Serta
Helpful?5QG9W3640AJR15234813404
Apr 6, 2026
Reviewer name: Marta Z
5 out of 5 stars
5 out of 5 stars review

Full size Mattress

Just unwrapped it.

Review from Serta
Helpful?5QG9W3640AJR15234813404
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?5QG9W3640AJR15234813404
Mar 28, 2026
Reviewer name: Sarah A
5 out of 5 stars
5 out of 5 stars review

Ashley Furniture

Great firm mattress

Review from Serta
Helpful?5QG9W3640AJR15234813404
Oct 26, 2024
Reviewer name: elgal
5 out of 5 stars
5 out of 5 stars review

Great quality!

[This review was collected as part of a promotion.] This mattress is super comfortable and gives us all the support we need, have seen a difference waking up with less body ache and strained back muscles.

Review from Serta
Helpful?5QG9W3640AJR15234813404
Jul 4, 2025
Reviewer name: Cheryl M
5 out of 5 stars
5 out of 5 stars review

Best Sleep I’ve Ever Had

Very firm but comfortably supports my spine after two surgeries. I go right to sleep without tossing and turning like I did with my previous mattress.

Review from Serta
Helpful?5QG9W3640AJR15234813404
Nov 15, 2024
Reviewer name: Rose M
5 out of 5 stars
5 out of 5 stars review

Truly the perfect sleeper!

Love the firmness of this mattress. I’m a stomach sleeper and this provides me with the perfect amount of support for a great nights sleep. Also great for my husband who is a back sleeper. No more aches and pains upon wakening.

Review from Serta
Helpful?5QG9W3640AJR15234813404
Jun 15, 2025
Reviewer name: Adam C
4 out of 5 stars
4 out of 5 stars review

Great mattress

This mattress starts out firm at first but after a few nights sleep is very comfortable. I normally sleep on my back and it’s very supportive of them mid to low back and cradled your body!

Review from Serta
Helpful?5QG9W3640AJR15234813404
Feb 21, 2025
Reviewer name: Susan D
5 out of 5 stars
5 out of 5 stars review

Sleep heaven

This mattress is so comfortable! It's firm but not too firm. I added my own pillow top and it feels like sleeping on a cloud. I'm a back sleeper and feel like this mattress has improved my sleep quality.

Review from Serta
Helpful?5QG9W3640AJR15234813404