SLUMBER CLOUD
Slumber Cloud UltraCool Pillow 2-Pack: Detailed Spec Analysis
The Slumber Cloud UltraCool Pillow 2-Pack leverages NASA-derived Phase Change Material (PCM) technology to actively regulate temperature throughout the night, setting it apart from pillows that simply use breathable fabrics. With medium/firm support in a king size and OEKO-TEX certification, this down alternative pair is best suited for couples or anyone wanting a cooler, allergy-friendly sleep surface at strong per-pillow value.
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Last updated: . Based on our analysis of 1,100+ pillows.
What Sets It Apart
Key specification highlights based on our analysis.
Down Alternative Fill
Fill type: down alternative
Cooling Technology
Pcm cooling (642 out of 1134 pillows have cooling)
Machine Washable
Entire pillow is machine washable (613 out of 1134 pillows are fully washable)
Pack of 2
Includes 2 pillows
Why We Recommend It
- 01.
PCM temperature regulation goes beyond passive cooling , absorbs excess heat and releases it as you cool down
- 02.
2-pack of king-size pillows (40x20in each) delivers strong per-pillow value for couples
- 03.
Entire pillow is machine washable, not just the cover , simplifies care and allergen removal
- 04.
OEKO-TEX certified free from harmful substances, suitable for allergy sufferers
- 05.
4.0 lbs per pillow provides substantial heft for a down alternative, indicating decent fill density
Considerations
- 01.
Customer feedback is mixed on cooling , some users report it sleeps hotter than expected despite PCM technology
- 02.
Multiple reviewers note the pillow compresses flat over time, raising durability concerns in this tier
- 03.
Medium/firm rating may still be too soft for dedicated side sleepers who need maximum loft
Technical Specifications
| Feature | Specification |
|---|---|
| Pillow Size | King |
| Pack Count | 2 |
| Dimensions | 40" L x 20" W |
| Weight Per Pillow | 4 lbs |
| Total Weight | 8 lbs |
| Fill Material | Down alternative |
| Fill Type | Fiber |
| Firmness Level | Medium firm |
| Cover Material | Polyester |
| Washable Cover | Yes |
| Cooling Technology | Pcm |
| Machine Washable | Yes |
| Certifications | OEKO-TEX |
Fill & Construction
The UltraCool uses a down alternative fiber fill that mimics the plush feel of natural down without the allergen concerns. At 4.0 lbs per king-size pillow, the fill density is moderate , enough to feel substantial out of the box, though customer feedback suggests it may compress over time.
The construction pairs this synthetic fill with Slumber Cloud's signature PCM-infused fabric for an integrated cooling approach.
Firmness & Support
Rated medium/firm, this pillow strikes a middle ground that works for both side and back sleepers. Side sleepers get adequate loft to maintain shoulder alignment, while back sleepers benefit from a supportive neck cradle that doesn't push the head too far forward.
However, the down alternative fiber can shift and compress with use, so the firmness you feel on day one may soften over several months.
Cooling & Breathability
The standout feature is Slumber Cloud's Phase Change Material technology , originally developed for NASA , which actively absorbs excess body heat and releases it as your temperature drops. This goes beyond passive cooling fabrics by actually regulating temperature rather than just allowing airflow.
That said, customer reviews are split: some find it noticeably cool to the touch, while others report it traps more heat than a traditional feather pillow, suggesting results vary by individual.
Care & Durability
Both pillows are fully machine washable , not just the polyester cover but the entire pillow , which is a genuine convenience advantage for maintaining freshness and removing allergens. The washable polyester cover case is removable for quick cleaning between full washes.
OEKO-TEX certification confirms the materials are tested free from harmful substances, adding peace of mind for sensitive sleepers.
Who Is This Pillow For?
Ideal For
- ✓ Couples shopping together , the 2-pack king size fits both sides of the bed and saves versus buying individually
- ✓ Allergy sufferers , OEKO-TEX certified down alternative fill plus full machine washability keeps allergens in check
- ✓ Back sleepers , medium/firm firmness provides a balanced neck cradle without excessive sink
- ✓ Hot sleepers wanting active cooling , PCM technology is a step above standard gel or ventilated foam
Not Ideal For
- ✕ Stomach sleepers , at 4.0 lbs and medium/firm, this pillow likely sits too high for prone sleeping comfort
- ✕ Buyers expecting long-term loft retention , customer feedback flags flattening over time, so those wanting years of consistent support may want to look elsewhere
- ✕ Shoppers on a tight entry-level who prioritize raw firmness , similarly tier single pillows may offer denser, more durable fill
These pillows typically arrive compressed and vacuum-sealed. Allow 24-48 hours for the down alternative fill to fully expand and reach its intended medium/firm loft after unboxing.
Tumble dry on low heat for 10-15 minutes after unboxing to accelerate fluffing and distribute the fill evenly
Give each pillow a good shake and karate-chop to the center to break up compressed fill clusters
Slumber Cloud is known for standing behind their temperature-regulation products, but specific warranty terms for this pillow 2-pack should be verified directly with the manufacturer or on the product listing before purchase.
FAQ
Does the Slumber Cloud UltraCool pillow actually keep you cool all night?
The PCM technology absorbs heat when you're warm and releases it when you cool down, creating a temperature-regulation cycle. Customer feedback is mixed , many find it noticeably cooler than standard pillows, but some hot sleepers report it doesn't eliminate heat buildup entirely.
It works best in combination with breathable sheets and climate control.
Can you wash the entire Slumber Cloud pillow in a washing machine?
Yes, the entire pillow is machine washable, not just the polyester cover. This makes it significantly easier to maintain than pillows requiring spot cleaning or cover-only washing.
Use a gentle cycle with mild detergent and tumble dry on low to preserve the fill and PCM fabric.
Is the Slumber Cloud UltraCool pillow good for side sleepers?
The medium/firm firmness provides adequate loft for side sleeping, helping maintain shoulder alignment and neck support. At 4.0 lbs and king dimensions of 40x20 inches, it offers enough height for most side sleepers.
However, those who need extra-firm support may find it compresses more than expected over time.
Does the Slumber Cloud pillow go flat over time?
Some customers report the down alternative fill compresses and loses loft after several months of use. This is a common characteristic of synthetic fiber fills compared to shredded foam.
Regular fluffing and occasional tumble drying can help restore some loft, but expect gradual softening with nightly use.
What does OEKO-TEX certification mean for this pillow?
OEKO-TEX certification means every component of the pillow , the down alternative fill, polyester cover, and PCM fabric , has been independently tested and verified free from harmful substances. This is particularly valuable for allergy sufferers and anyone sensitive to chemicals, ensuring the materials meet strict safety standards.
Is the Slumber Cloud 2-pack worth the tier compared to buying single pillows?
The 2-pack format delivers better per-pillow value than buying individually, making it a practical choice for couples outfitting both sides of the bed. The king size at 40x20 inches fits standard king pillowcases.
Whether it's worth it depends on how much you value the PCM cooling technology , if cooling is a priority, the per-pillow savings are meaningful.
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Bottom Line
The Slumber Cloud UltraCool 2-Pack is a well-conceived pillow set that combines PCM temperature regulation with the practical benefits of machine washability and OEKO-TEX certification. It's a strong pick for couples who want allergy-friendly, cooler-sleeping pillows without the fuss of separate purchases.
Just go in with realistic expectations on loft longevity , the down alternative fill may soften faster than foam alternatives.
Best for couples wanting temperature-regulating, easy-care pillows with allergy-friendly credentials
Consider alternatives if you need long-term loft retention or extra-firm support for dedicated side sleeping
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