COOLING TECH·SLUMBER CLOUD
Slumber Cloud Nacreous Cooling Mattress Pad (Queen)
4.3 · 1,800 reviews
Editor score8.3/10
Best for: Hot sleepers without electronics, side sleepers, budget cooling
Lowest price we found
$199.00
At Amazon · checked 2026-07-01
Buy at Amazon · $199.00 ↗Updated 2026-07-01
Type
Passive phase-change material
Cooling
NASA Outlast tech
Electronics
None
The passive cooling mattress pad — no cords, no pumps, just NASA-derived Outlast material that absorbs body heat.
Slumber Cloud Nacreous uses NASA-developed Outlast phase-change material to absorb + release body heat as you sleep. No electronics — completely passive. Sits under your fitted sheet like a mattress protector. Machine-washable. 5-year warranty. $200 Queen is a fraction of Chilipad/BedJet price. Best for hot sleepers who don't want cords + pumps in bed.
Price across 3 retailers
Prices checked 2026-07-01amazon
AmazonBest price✓ Fast delivery · easy returns
Search-fallback · NASA Outlast material · passive cooling
$199.00
2026-07-01
Prices shown were last checked on 2026-07-01and can change at any time — the price on the retailer's site at checkout is the one that applies. As an Amazon Associate and affiliate we may earn a commission on purchases made through these links, at no extra cost to you.
How our prices work
We show the lowest price we found at our last check (2026-07-01) and the manufacturer's list price for comparison. Retail prices — Amazon's especially — move constantly, so treat these as a guide: the price shown on the retailer's own page at checkout is the one that applies. Tap through to see each retailer's current price.
Should you buy it?
What we like
- NASA-derived Outlast absorbs heat passively
- No cords, pumps, or noise — zero maintenance
- Works with any bed instantly
What to know before buying
- Buffers heat spikes; can't beat a hot room
- Premium price for a mattress pad
- Effect is subtle vs active systems
At a glance
TypePassive phase-change material
CoolingNASA Outlast tech
ElectronicsNone
Machine washableYes (cool water)
SizesTwin to Cal King
Warranty5 years
Best forHot sleepers without cords
Depth3" (fits fitted sheet)
CareMachine wash
CertificationsOEKO-TEX
How it scores
How our 8.3/10 breaks down — rated on the dimensions that matter most for cooling tech, from hands-on testing and verified specs, not the marketing.
Cooling power
7.5/10
Comfort
8.5/10
Ease of use
9.5/10
Durability
8/10
Value
8/10
Compare with alternatives
Quick verdicts for the cooling tech most often considered alongside the Slumber Cloud Nacreous Cooling Mattress Pad (Queen).
VS·HEAD-TO-HEAD
Slumber Cloud Nacreous Cooling Mattress Pad (Queen) vs BedJet 3 Climate Comfort System
The under-mattress climate system — hot AND cold air blown between your sheets, controlled by app.
→ Couples with different temps, hot sleepers, non-Eight-Sleep alternative
VS·HEAD-TO-HEAD
Slumber Cloud Nacreous Cooling Mattress Pad (Queen) vs Chilipad Dock Pro Cooling Mattress Pad (Queen)
The water-circulating cooling mattress pad — sits on top of your existing mattress, precise 55-115°F control.
→ Precise temperature control, non-Eight-Sleep alternative, couples
VS·HEAD-TO-HEAD
Slumber Cloud Nacreous Cooling Mattress Pad (Queen) vs Molecule CopperWELL Cooling Adjustable Pillow (Queen)
Adjustable gel-memory-foam pillow with copper-infused cover for real cooling — fill customization + tech.
→ Hot sleepers wanting adjustable pillow, side sleepers, cooling-first
Decision support · what no other comparison site has
Take the quiz · 60 secNot sure which one is right for you?
Our 60-second sleep score quiz asks 8 questions and recommends the right sleep gear for your goals. Built by sleep engineers. Free, no signup.
Frequently asked questions
Slumber Cloud vs Chilipad Dock Pro?
Slumber Cloud is passive (no pump, no cords). Chilipad is active water circulation. Slumber Cloud is $200 vs $999. Different price tiers, different features.
Does Outlast really work?
Yes — NASA-derived technology has real thermal absorption. Not as cold as active cooling but genuine improvement over standard cotton pads.
How does it wash?
Cold water, gentle cycle, tumble dry low. Preserves the phase-change material. Skip fabric softener.
Slumber Cloud vs bamboo cooling pad?
Slumber Cloud has real active cooling tech. Bamboo pads just breathe better. For active cooling without electronics, Slumber Cloud wins.
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