Yawnder mattress reviews · Updated October 2026

The Brentwood Home Crystal Cove offers two distinct sleeping surfaces: a softer memory-foam side and a firmer latex side, both supported by pocketed coils. That makes it appealing if you want a real choice of feel in one mattress, though flipping a heavy hybrid takes some effort.

Our take: Consider Crystal Cove if you want the choice between a more cushioning foam surface and a more responsive latex surface. If you already know you dislike either feel, or cannot comfortably flip a heavy mattress with help, a single-sided alternative may be easier.

Crystal Cove at a glance

Feature	What to know
Type	Flippable hybrid with pocketed coils
Feel	Medium-soft foam side; medium-firm latex side, according to Brentwood Home
Best for	Sleepers who want a choice of surfaces and a responsive coil core
Trade-off	Heavy to move and flip; the two sides have different feels

Our hands-on experience

When we originally unboxed the Crystal Cove, the mattress was unusually heavy and tightly compressed. Once the packaging was opened, it regained its shape quickly. We found the two sides offered meaningfully different feels: the charcoal-infused foam side was plusher, while the natural-latex side felt firmer and more buoyant. These observations describe the sample we reviewed, not a new test of every current production version.

Yawnder's original Crystal Cove mattress after unboxing — Our original Crystal Cove unboxing photo.

Box used for the original Brentwood Home mattress delivery — The box from our original delivery.

See the original demonstrations: watch the first review video and watch the second review video. How Yawnder tests mattresses.

Watch our original Crystal Cove mattress review
The video shows the earlier mattress we reviewed; current specifications may differ.

Yawnder original Crystal Cove mattress review

Construction and materials

Brentwood Home currently describes a dual-sided hybrid with an organic latex layer on one side and charcoal-infused memory foam plus Flow Foam on the other. An eight-inch zoned pocket-coil unit sits between the comfort surfaces; the brand also describes a reinforced perimeter. Its current listing identifies the mattress as vegan and GREENGUARD Gold certified. Check the manufacturer’s current specifications for the precise version and certifications.

Flipping changes which comfort layer faces you; it does not turn one mattress into two independently adjustable halves. If partners prefer different surfaces, both will have to agree on the side in use.

Firmness and sleeping positions

Side sleepers: The softer foam side is the logical starting point if your shoulder or hip needs more cushioning. People who prefer a firmer surface may find the latex side comfortable, but pressure relief depends on body weight and preference.

Back and stomach sleepers: Try the latex side first if you prefer less sink. Check whether your hips feel supported without creating pressure at the lower back; neither side can guarantee a particular alignment for everyone.

Combination sleepers: Latex has a springier, more responsive feel than memory foam and may make changing positions easier. The foam side offers more of a contouring sensation.

Who should buy: Sleepers who want to choose between a softer foam surface and a firmer, more responsive latex surface. Who should skip: People who need an easy-to-move mattress, want independently adjustable sides, or already know they prefer one specific feel.

New to coils and foam combinations? Read our guide to hybrid mattresses for a broader comparison.

Motion, edge support and temperature

In our original review, the coil system provided edge stability and responsiveness. The foam side may absorb movement differently from the latex side, so couples should test both. Pocketed coils allow more airflow through the core than a solid foam base, but bedding, room temperature and the sleeper all affect heat; no material guarantees a cool night.

Price, shipping and trial

Prices, sizes and availability change. Brentwood Home currently lists a one-year mattress trial with a 30-day adjustment period and a 25-year limited warranty; confirm eligibility and the latest terms before ordering. Because the mattress is heavy, plan for a second person when moving or flipping it.

Check Crystal Cove availability →

Affiliate disclosure: Yawnder may earn a commission if you purchase through this link, at no additional cost to you.

Frequently asked questions

Can you flip the Crystal Cove?

Yes. It is designed to be used on either side, with foam on one surface and latex on the other. Ask for help when flipping it because it is heavy.

Is the Crystal Cove all latex?

No. Its current construction combines a latex comfort surface, a memory-foam comfort surface and a pocketed-coil core.

Which side is softer?

Brentwood Home describes the memory-foam side as medium-soft and the latex side as medium-firm. Individual impressions vary.

Idle Sleep Dual Firmness mattress from the original review archive — The original Idle Sleep Dual Firmness mattress.

Quick verdict: a historical, flippable mattress

Yawnder originally tested the Idle Sleep Dual Firmness mattress, an all-foam design with a softer side and a firmer side. This page is a record of that test. Idle Sleep is reported to be out of business, so do not assume its old direct-sale trial, returns or warranty can be honored; ask any seller for written support terms before buying an older or resold product.

In the original test, Ben described the softer side as medium firm, preferred it to the firmer side, and observed less motion on the softer side. Comfort and durability vary by sleeper and by mattress condition.

Compare current two-sided options by feel, support, weight, and return terms; see our other archived Idle Sleep review and mattress comparisons.

Historical test: The original account below describes the model, prices and manufacturer policies at the time of testing. These offers should not be treated as current.

At the time of this review, Idle Sleep was an online mattress brand that has multiple mattress models that have one thing in common, they can all be flipped. This means you can sleep on either side. This is a construction that harkens back many decades when you could maximize the lifespan on your mattress by wearing each side evenly. This was true then and is true now with Idle Sleep.

Their Dual Firmness mattress is a little different in that each side is a different firmness. This gives you the option of sleeping on a firm or soft side. At the time, the queen was listed at $1,199

Overview of the Idle Sleep Dual Firmness Mattress

The reviewed offer included a 120-night trial at the time. That means you can try out the mattress in your house for 120 days and if you don’t like it, you can return it for a full refund. There’s no need to ship it back either, Idle will work with you to take care of the return.

The brand then advertised U.S. manufacturing and a lifetime warranty; availability of support today is unverified.

Here’s a quick overview of the mattress. In the video, I show you how easy it is to flip as it comes with handles on each side that are stitched into the mattress.

Construction of the Idle Dual Firmness Mattress

idle sleep construction — Construction illustration from the original Idle Sleep review.

Below are the construction details of the mattress as listed on the Idle Sleep website.

Queen size) 112lbs

Materials:
Super Soft Quilting foam,
IDLE buoyancy foam
Foam core
Comfort foams on BOTH sides

• MEDIUM-FIRM SIDE
Cover ALL-NATURAL Organic Cotton all the way around
1. .5” quilting foam on each side1.512 density
2. 2” IDLE buoyancy Foam 3.5lb
3. 2” transition poly layer 1.828 lb
4. 4” High Density Foam Core 1.835lb

• FIRM SIDE
1. .5” quilting foam on each side1.512 density
2. IDLE buoyancy Foam 3.5lb
3. .5” quilting foam on each side1.512 density

My Idle Sleep Findings

Below is a photo of my 14 lb. bowling ball on the soft side of the Idle Sleep Mattress. On a firmness scale I would say this is a medium firm feel.

Soft Side of idle sleep dual — Ben’s bowling-ball test on the softer side of the original mattress.

The other side felt more firmly supportive to me.

In this test, I observed relatively little motion transfer. Below is a video illustrating motion transfer on the soft side. The soft side absorbs more motion than the firm side.

Original soft-side motion test

Watch on YouTube

Here’s a video of the firm side of the mattress. There isn’t that much difference between the two but I noticed the soft side absorbed a little more motion.

Original firm-side motion test

Watch on YouTube

My Idle Sleep Recommendation

Dual firmness mattresses are excellent guest bedroom mattresses because they give you two choices in one. But this mattress is also great for your bedroom every night. I prefer the softer side as I generally like a softer mattress but people on the lookout for a firm mattress will appreciate the firm side of the Idles Sleep.

At the time, I considered the two-sided design useful for a guest bedroom or a mattress for an Airbnb!

Frequently asked questions

Was the reviewed Idle Sleep mattress flippable?

Yes. This specific Dual Firmness sample had two sleeping surfaces; the original test describes a softer side and a firmer side. Other models can differ.

Can I rely on the original trial or warranty?

The original offer is historical. Idle Sleep is reported to be out of business, so verify in writing whether any seller or third party will provide support before buying.

Which side did Ben prefer?

In the original review, Ben preferred the softer side and described it as medium firm. The firmer side felt distinctly firmer to him.

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