Sleeping Duck MACH II

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TL;DR: Durable, customizable firmness with inserts; very heavy.

Overall

#6 in

Mattress

according to Reddit Icon Reddit

Sentiment score81% positive
47
5
6

Top Pros

Top Cons

Last updated: Jul 3, 2026

Reddit Reviews

Reddit IconAshamed_Fly_666
8 months ago

Never found a mattress worth splurging on till Sleeping Duck, I’m never going back. Ours is half firm (my side), half soft (husbands side) and everyone’s already talked about how great it is except THE BEST PART! The bed doesn’t shake as much as other beds on your side when the other person moves/turns over!!! The amount of sleep that’s saved me is insane.

Reddit Iconbradbull
8 months ago

I've tried nearly all of them and SD is the best (it's my second, changed from Q to K). Although i'd caution on getting the firm-only one because it is quite firm and might be too firm for you. I do wish I'd paid a bit more for the one you can customise.

Reddit IconOutside-Bath
8 months ago

Yeap! Mach II. I went from a double bed to a king and you shouldn’t underestimate just how big that is. I’ve always been told that soft mattresses aren’t supportive but this has not let me down at all

8 months ago

Only 6 months in. I still can’t believe what I was sleeping on before this giant marshmallow of softness.

8 months ago

A firm, supportive marshmallow if you will. Also my first mattress in a box and watching it expand was wicked

Reddit Icon24andme2
8 months ago

We have sleeping duck and we like it. We have been rotating it but still have a divot on my partners side. The mattress height is my biggest complaint. I have deep sheets from the US which work - had to have someone bring them because I couldn't find deep enough sheets that we liked here.

Reddit IconAb-Ab_
about 1 month ago

Ordered a sleeping duck in firm, I ended up getting a free switch for my half of the bed to a medium firmness as I am a side sleeper and we've love it since! It's been almost 7 years now and it's still going strong.

Reddit IconAcceptable-Wind-7332
7 months ago

Yeah, we've had a "firm" Sleeping Duck for about five years and it still feels as firm as the day we got it.

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Rankings by Use Case

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Individuals who toss and turn frequently, or couples who prioritize a mattress that is responsive and bouncy for sexual activity, and dislike the "sinking" feeling of memory foam.
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Best for Heavy & plus-size sleepers

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Ranked #1

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Individuals with higher body weights (typically 230 lbs or more) who find that standard mattresses quickly sag, lose support, and cause back or joint pain.
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Best for Hot sleepers

Purple - The Purple Mattress

Ranked #1

Purple - The Purple Mattress

Individuals who consistently wake up feeling hot or sweaty, and find that their mattress absorbs and retains body heat throughout the night.
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Best for Long-term durability

Sleep EZ - Organic Latex Mattress

Ranked #1

Sleep EZ - Organic Latex Mattress

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

Helix - Midnight Luxe

Ranked #1

Helix - Midnight Luxe

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

Sleep EZ - Organic Latex Mattress

Ranked #1

Sleep EZ - Organic Latex Mattress

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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