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 narrow margin (4.3 vs 4.5). The gap is mostly about 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 #5 in Best Cooling Pillows

Purple Harmony Pillow

4.3

3 sources$209as of Aug 1

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
— Ventilated Talalay latex core has thousands of pin-holes that further amplify cooling
— Three loft heights (Low 5.5", Medium 6.5", Tall 7.5") fit any sleep position

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

$209 · Check Price on Amazon Full review →

Higher ratedRanked #3 in Best Cooling Pillows

Slumber Cloud UltraCool Pillow

4.5

3 sources1 derived$92.2as of Aug 1

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, and Sleepopolis, reviewing the same Outlast fabric in Slumber Cloud's Nacreous cover, called it quite breathable and credited it with limiting heat retention overnight. The 30-night trial is the shortest here.

Strengths

— Outlast phase-change fabric absorbs and releases heat rather than just feeling cool at first touch
— Two firmness options and three sizes, including a 48-inch body pillow
— OEKO-TEX STANDARD 100 certified, with cover and fill both machine washable

Watch-outs

— The initial cool-touch sensation fades as the phase-change material saturates
— A 30-night trial is the shortest in this lineup
— Cooling is noticeably blunted by a thick pillowcase

$92.2 · Check Price on Amazon Full review →

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

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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