Head-to-head · Best Cooling Pillows

Purple Harmony Pillow vs Slumber Cloud UltraCool Pillow

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

Slumber Cloud UltraCool Pillow comes out ahead by a clear margin (4.5 vs 4.1). Slumber Cloud UltraCool Pillow is best for: Hot sleepers who want sustained cooling and prefer the soft, moldable feel of fiberfill to foam or latex. Read the strengths below before deciding.

Ranked #4 in Best Cooling Pillows

Purple Harmony Pillow

4.1

3 sources$194as of Nov 5

Purple's Harmony takes an engineering-first route to cooling. Rather than PCM fabrics or gel coatings, it wraps a 360-degree GelFlex Hex polymer grid around a ventilated Talalay latex core, moving air through the whole pillow body. Reviewers consistently rate it 5/5 for temperature regulation. The feel is unusual and not for everyone, but cooling performance ranks among the best in the category.

Strengths

— GelFlex Hex grid contains 1,500+ open-air channels for industry-leading airflow
— Three loft heights (Low 5.5", Medium 6.5", Tall 7.5") fit any sleep position
— Moisture-wicking nylon-spandex mesh cover wicks sweat away rather than absorbing it

Watch-outs

— Most expensive pillow on this list at $179 standard medium
— Hex grid feel is polarizing — some find it cradling, others find it springy and odd
— Mesh cover developed pulls in Tom's Guide's month-long test

$194 · Check Price on Amazon Full review →

Higher ratedRanked #2 in Best Cooling Pillows

Slumber Cloud UltraCool Pillow

4.5

1 source$92.2as of Sep 25

The Slumber Cloud UltraCool Pillow puts Outlast phase-change fabric, the material Slumber Cloud built its bedding line on, into a soft down-alternative pillow. Apartment Therapy rated the adjustable version 4.5 out of 5. The 30-night trial is the shortest here.

Strengths

— OEKO-TEX STANDARD 100 certified, with cover and fill both machine washable
— The Adjustable model's two-insert system changes the firmness profile substantially
— Outlast treatment is worked into the fibers rather than laminated on top

Watch-outs

— Polyester fiberfill feels less breathable than latex or silk in a humid room

$92.2 · Check Price on Amazon Full review →

How they stack up

Purple Harmony Pillow

The most engineering-forward cooling pillow in this lineup — the Hex grid and ventilated latex deliver more raw airflow than the Coop Cool+ or Slumber Cloud UltraCool, both of which lean on surface cooling tech. The trade-off is feel: Purple's responsive bounce-back is unique. Saatva Latex shares a latex core but uses shredded latex (more conforming) while Purple uses solid latex with a polymer grid wrapped around it (more buoyant). Coolest on whole-pillow airflow, less cool on contact than the Cool+ or UltraCool. Cozy Earth Silk feels like a different category entirely.

Slumber Cloud UltraCool Pillow

It trades the adjustable loft of the Coop Cool+ for the Outlast fabric, which is the more proven temperature-regulating material in this category. It cools harder on contact than the Saatva Latex Pillow, though the Saatva's airflow story is more consistent in a hot bedroom, and it is roughly level with the Purple Harmony on temperature while feeling much softer.

Specs side-by-side

Spec	Purple Harmony Pillow	Slumber Cloud UltraCool Pillow
Material	Hyper-Elastic Polymer grid + Talalay latex	Down-alternative polyester fiberfill
Fill	Solid ventilated Talalay latex core	100% polyester fiberfill (adjustable on Adjustable model)
Cover	92% nylon, 8% spandex moisture-wicking mesh	100% polyester knit with Outlast coating
Cooling Tech	1,500+ air channels in Hex grid + pin-hole latex	Outlast phase-change material (NASA-derived)
Loft Options	Low 5.5", Medium 6.5", Tall 7.5"	—
Sizes	Standard, King	Standard 20x26, King 20x36, Body 20x48
Trial Period	100 nights (via Purple direct)	30 nights
Warranty	1 year	180 days
Loft Adjustable	No — fixed loft (choose Low/Medium/Tall at purchase)	Yes on Adjustable model; fixed on standard
Certifications	Hypoallergenic, dust-mite resistant	OEKO-TEX STANDARD 100
Care	Machine wash cover cold, air dry; spot clean core	Machine wash cold, tumble dry low

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