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Serta Perfect Sleeper X Knox Hybrid Mattress

This mattress is very firm & comfortable mattress.

Serta Knox Firm Mattress

Serta

Great

I wanted a firm mattress and I found the perfect one.

Super firm

Just got today, I’ll know better tomorrow.

John P like looks

First week down. Mattress is very supportive.

So far so good!

It’s a really nice mattress we just have to get use to the firmness!

Firm but comfy

Very firm and love the zero G

So far, comfortable and may help the back issues.

New Serta Mattress

Good quality

This mattress is so comfortable. It gives to your body but also supportive.

Extremely comfortable

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.

Horrible

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.

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