Kingsdown Silent Partner X1

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Overall

#1476 in

Mattress

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Sentiment score33% positive
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Last updated: May 9, 2026

Reddit Reviews

Reddit IconAZredrock
3 months ago

COSTCO CANADA "KINGSDOWN" mattress. (k/s) Very supportive 2 years in. Don't know if Costco USA carries them.

Reddit IconMaluma_Goat
4 months ago

Thanks for doing this! I purchased a Kingsdown mattress this past summer from Sleep Country Canada, cost me nearly $3K. I was told it’s one of the best in the store. At first the mattress was excellent. But now there’s a noticeable dent where I sleep (it’s not memory foam). It’s extremely uncomfortable and I wake up with back pain from the dent . I’m super upset and plan to speak w the store. Any idea as to why this happened or what I should do?

Reddit IconAcceptableHamster149
3 months ago

I've been very happy with Kingsdown, which you can also get at Sleep Country among other chains. It's also Canadian, along with a bunch of other manufacturers that've been listed here

Reddit IconAtempestofwords
11 months ago

The only way you're going to get away from some motion transfer is by getting a decent coil system. The purple is absolutely one of the worst mattresses for motion transfer out there. Tempurpedic is really good at avoiding but you'll need to go up to the pro adapt soft line for your desired feel. You could also look at some of the Kingsdown mattress', Matt warehouse has a couple that could serve you well. Sunham or Wilcrest.

Reddit IconChoosepeace
7 months ago

We recently moved , and went to pick out a new mattress. Together at the store, we laid on several, and selected a Kingsdown mattress. It’s been a wonderful one! I’m menopausal, and take medication that causes even more night sweats, and the mattress is still comfortable. It’s the perfect firm / soft combo as well. Of course, I always use a mattress cover to protect the mattress.

Reddit IconDdyBrLvr
7 months ago

We’ve had our Endy for 5 years. It’s quite comfortable. I am 200# and have noticed a bit of a depression where I sleep, but I rarely wake with a back ache. Had a Kingsdown before, was more expensive, and broke down in just 3 years.

Reddit Icondebbie666
7 months ago

Kingsdown are my favorite. I'm a side sleeper so I went with the softest top, but they have medium and firm as well.

Reddit IconMorockaDishoom
about 2 months ago

Avoid those perfectly rectangular hybrid mattresses, they start warping at the top seams. If you care about a lasting mattress NEVER buy a BIAB. A BIAB is a half made mattress, as a Kingsdown is an excellent brand, they are the only brand that runs durability tests every mattress that leaves their plant. You can get one on sale for $3k, or haggle the price there. No matter what you choose, expect a month of discomfort to acclimate to the increased support. If you’re coming off a really shitty lumpy bed to a nice one, your back will find discomfort as you’re using new muscles to help straighten your back. Mattressfirm legit has the most value for the buck, but more important is they have a good return and exchange policy as long as the bed is bought new (not clearance) and it ain’t scuffed or damaged. Of all retailers, they tend to be the safe bet, and they’ll price match anyone if you have proof.

Rankings by Use Case

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Best for Hot sleepers

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Best for Long-term durability

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Buyers who view a mattress as a long-term investment and want to purchase one that will maintain its support and comfort for over a decade, prioritizing total cost of ownership over a low initial price.
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Best for Motion isolation for couples

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Couples or co-sleepers who are easily woken up by a partner's tossing, turning, or getting in and out of bed.
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Best for Natural & organic materials

SleepOnLatex - Pure Green Organic Latex Mattress

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Health-conscious individuals or those with chemical sensitivities who want to avoid synthetic foams, chemical off-gassing, and potentially hazardous materials like fiberglass in their sleep environment.
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