Nest Love & Sleep Mattress Review - layers of foam

What Exactly are PCMs and How do They Keep the Mattress Cool?


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Of the 60+ beds I've reviewed, these are my current favorites:
My Top PickType of MattressPrice
1. Saatva ClassicInnerspring$799 - $1,599
Save $200!
2. Puffy LUX
Luxury Foam$1,145 – $1,695
Save $300!
3. Leesa Original
Budget Foam$624-$1,049
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4. Nest Alexander HybridLuxury Hybrid$949-$1,699
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5. PlushBeds Botanical BlissLuxury Organic Latex$999 – $1,998
Save $1,200+!
6. EcoterraBudget Latex$749 - $1,249
Save $175!
7. DreamcloudLuxury PillowTop$599-$1,099
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8. LaylaFlippable/2-Sided$499 - $999
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9. Big FigFor Plus-Sized People$1,299 - $1,999
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10. HelixCustom-Fit$500 - $1,149
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Mattress toppers & pads are a great way to cool your bed and extend its life.
Topper SizeMaterialFirmnessWarr.
LINENSPA
LINENSPA 2 Inch Gel Infused Memory Foam Mattress Topper, Twin
Best Value2"Gel memory foamMedium3 years
MOLECULE AIRTEC
MOLECULE AIRTEC
Best Comfort3"Memory foamMedium-firm5 years
MyPillow
MyPillow Three-inch Mattress Bed Topper (Twin)
Best pressure point relief3"FoamMedium-firm10 years
LUCID
LUCID 2-Inch Ventilated Gel Infused Memory Foam Mattress Topper - Full
Best cooling2"Gel memory foamSoft3 years
Milemont
Milemont Mattress Topper Twin, 2-Inch Cool Swirl Gel Mattress Topper for Twin Size Bed, Blue
Best for back pain2"Gel memory foamMedium10 years
Pure Green
Pure Green 100% Natural Latex Mattress Topper - Firm - 2 Inch - Queen Size
Best for stomach sleepers2"Natural latexExtra-firm5 years
Sleep Innovations
Sleep Innovations 4-inch Dual Layer Gel Memory Foam Enhanced Support, King, Made in the US Mattress Topper
Best for side sleepers4"Gel memory foamSoft10 years
Sleep Number DUAL TEMP
Sleep Number DUAL TEMP
Best temperature regulation-Forced Air-1 year
TEMPUR ProForm
Tempur-Pedic TEMPUR Supreme 3-Inch Mattress Topper Medium Firm, Full, White
Best memory foam3"Memory foamMedium-firm10 years
Avocado Green
Avocado Green
Best organic2"Organic latexSoft/firm10 years
Bed cooling/heating systems have come a long way – especially the BedJet, my favorite.
SystemTypeBest For...Temp. RangeControl
BedJet V3
BedJet V3
Air cooledBest Overall (esp. for night sweats)66°F-104°FWireless remote control/smartphone app
ChiliPad Cube 3.0
Chili Technology chiliPAD Cube 3.0 - ME and WE Zones - Cooling and Heating Mattress Pad - Individual Temperature Control, Great Sleep Enhancement, Wireless Remote Integration (Queen (80" L x 60" W))
Water cooledBest water cooling system55°F-115°FWireless remote control
Ooler Sleep System
Ooler Sleep System
Water cooledBest temperature control55°F-115°FSmartphone app via Bluetooth
The Pod by Eight Sleep
The Pod by Eight Sleep
Water cooledBest smart cooling system55°F-115°FSmartphone app/smart voice assistant
Mattress Cooler "Classic"
2020 Mattress Cooler "Classic" Chilled Water Sleep Cooling System (Now with a Spare "27x63" Cooling Pad)
Water cooledBest budget cooling systemN/AWireless remote control
SleepNumber Dual-Temp v3
SleepNumber Dual-Temp v3
Air cooledN/ARemote control
bFan Cooling System
bFan Cooling System
FanBest bed fanN/AWired remote control
Brookstone bed fan
Brookstone Bed Fan with Wireless Remote
FanN/AWireless remote control
These pillows excel at relieving neck and shoulder pain:
PillowWhy I Like It
PlushBeds Shredded Natural Latex Pillow
Best Cooling Mattress Pads

best shredded latex pillow for side sleepers
Coop Home Goods Memory Foam
Coop Home Goods - Premium Adjustable Loft Pillow - Hypoallergenic Cross-Cut Memory Foam Fill - Lulltra Washable Cover from Bamboo Derived Rayon - CertiPUR-US/GREENGUARD Gold Certified - Queen
perennial, proven Amazon Choice with over 16,000 reviews
MARNUR Contour Pillow
MARNUR Cervical Memory Foam Pillow Orthopedic Contour Pillows for Neck Pain Ergonomic Pillow with RoHS Certification and Pillowcase Covers, White(23.5×14.5×5.5 Inch)
perfect spine support using a groove down the middle
SleepRightSplintek Side
SleepRight Splintek Side Sleeping Pillow Memory Foam Pillow – Best Pillow for Sleeping On Your Side – 24" x 5" Standard Size
full facial cradle plus a perfectly-angled shoulder cradle
Xtreme Comforts Adjustable Pillow
Xtreme Comforts Hypoallergenic, Adjustable Thickness, Kool-Flow Micro Vented Bamboo Shredded Memory Foam Bed Pillow for Sleeping, Back, Stomach & Side Sleepers, Queen Size, Made in USA
thinner and softer than most, so your head will not bend back
UTTU Sandwich Pillow
UTTU Sandwich Pillow, Adjustable Memory Foam Pillow, Bamboo Pillow for Sleeping, Cervical Pillow for Neck Pain, Neck Support for Back, Stomach, Side Sleepers, Orthopedic Contour Pillow, CertiPUR-US
designed specifically for neck support and alignment.
Mediflow Water Pillow
Mediflow Fiber: The First & Original Water Pillow, clinically Proven to Reduce Neck Pain & Improve Sleep. Therapeutic, Ideal for People Looking for Proper Neck Support
clinical tests prove it reduces neck pain
Cradle Me Cervical Pillow
Cradle Me Cervical Pillow - Orthopedic Contour Memory Foam Pillow for Back and Side Sleepers with Neck and Spine Support - Helps Reduce Back and Neck Pain
best overall design with lots of position choices
KaUa Neck Roll
K Ka Ua Neck Roll Pillow Cervical Bolster with Bamboo Cover – Memory Foam Spine Lumbar Traction Spondylosis Support 4” Diameter x 17 “Length (4 Inch)
1,000s of satisfied customers & rave reviews
J-Pillow Travel Pillow
J-Pillow Chin Supporting Travel Pillow - 2020 Version - British Invention of The Year Winner - Supports Your Head, Neck & Chin (Blue)
added chin support prevents your head from falling forward.
Nursal Contour
NURSAL Knee Pillow for Side Sleepers - Wedge Contour Support Pillow for Leg, Orthopedic Knee Pillow for Sciatica Relief, Back Pain, Leg Pain, Pregnancy, Hip and Joint Pain
great reviews, washable cover - and half the price
These are my favorite luxury sheet sets sold online:
Best Luxury SheetsIncludesSizesColours
Parachute
Parachute
Fitted sheet + two pillowcasesTwin to Cal KingSand, Slate, White, Light Grey, Blue
Brooklinen
Brooklinen Luxe Core Sheet Set – Includes 1 Flat Sheet, 1 Fitted Sheet + 2 Pillowcases – 480 Thread Count Sateen Sheet Set – 100 Percent Long-Staple Cotton – Oeko-TEX Certified – Smoke – Twin
One flat sheet, one fitted sheet, and two pillowcases.Twin to Cal KingWhite, Cream, Steel, Smoke, Smoke Stripe
Saatva
Saatva
One flat sheet, one fitted sheet, and two pillowcases.Twin to Cal KingWhite, Ivory, Grey
Boll and Branch
Boll & Branch Luxury Fair Trade Long Staple Organic Cotton Sheet Set - Full, Natural
one fitted sheet, one flat sheet, and two pillowcases.Full, Queen, King, Cal King onlyWhite, Solid Natural, Striped White, Pewter
Best For Specific Needs Soft and Warm: Parachute’s Sateen sheets Most Luxurious: Brooklinen’s Linen sheets Organic Luxury Sheets:  Saatva Lofton Organic sheets Breathable/Cool: Percale sheets from Parachute or Brooklinen
NOTE: We earn from qualifying purchases made via Amazon Associates and other affiliate programs. Learn more.

Online mattresses use various cooling techniques. Some use punctured foam while others combine foam with cooling gel. The Nest Love & Sleep mattress and several others use a phase change cover.

This is a type of cover embedded with PCMs or Phase Changing Materials.

A phase change cover is regarded as one of the best way to keep a mattress cool. But what exactly are these PCMs and how do they work?

PCMs

Phase change materials have been used for years in many insulation applications where a constant temperature range is extremely crucial.

Here's how they work.

When temperature rises, they warm up and melt. They absorb heat during this phase change, causing the surroundings to cool. The opposite happens when temperature falls. They freeze and release heat, warming up the environment.

This principle works really well in phase change mattress covers. The cover keeps you in a sweet spot that is ideal for sleep – not too cold and not too warm.

If temperature approaches either extreme, the PCMs react to bring things back to the perfect range.

Here’s a more detailed explanation of how PCMs work in mattresses.

PCMs in Mattresses

Zotto Sleep
The Zotto mattress contains PCMs in the memory foam

When you get into bed, you start warming up gradually as heat released by your body is trapped underneath the bedding and in the mattress foam.

This is all good until the bed gets too warm from the trapped heat. Memory foam mattresses are especially notorious for getting overly hot because they retain more heat.

That’s when the PCMs kick into action.

Depending on the type of PCMs used, they will react when the temperature rises to a specific point.

Before that they will get warm alongside the mattress. But once the trigger temperature is reached, the PCMs begin to melt into a liquid.

This is where it gets interesting.

As the phase change materials melt, they absorb a lot of heat from the surrounding, in this case the bed. But the PCMs themselves do not get warmer. It's like blowing a balloon without inflating it.

PCMs can store huge amounts of heat without a change in temperature.

As they absorb heat, the mattress quickly cools down.

It also works the other way when the bed gets too cold.

The PCMs also get cooler until the trigger temperature is reached. They then freeze back into a solid. As they freeze, they release the stored heat into the environment.

Again, they do not change temperature even as they lose heat.

This warms up the bed again.

As the PCMs oscillate between these two phase changes (solid and liquid), they keep the mattress within a comfortable temperature range, never letting you get too warm or too cold.

Here's a visualization of how PCMs work.

How PCMs work
Credit: Microtek Labs

PCMs in mattresses are usually added to the cover, rather than the foam underneath, because they work better when they are very close to your body.

But a few mattresses, like Zotto, add PCMs to the foam layers, usually the top layer.

Types of PCMs

Different PCMs have different temperature ranges. Manufacturers choose those that will maintain the mattress at the ideal sleep temperature range.

Companies don’t usually announce which PCMs they have used. But most use special waxes (Polyolefins) in form of polymer chain links or encapsulated gels. They’ll often use more than one type of PCM in the mattress to achieve better temperature control.

Who Should Buy a PCM Mattress?

Anyone who needs a mattress that stays cool all the time.

If you are sensitive to heat as you sleep or you live in a hot climate, a PCM mattress will help you sleep more comfortably.

If you are planning to buy a memory foam mattress, it’s a good idea to find one that uses a PCM cover.

This is because memory foam traps a lot of heat and can make the bed too warm. A phase change cover will prevent overheating.

Mattresses with PCMs

Here are some of the mattresses that use phase change materials. It is not a complete list.

  • Nest Love & Sleep mattress – a 3 layer mattress consisting of Energex foam and poly foam. The PCMs are in the cover. See our review of the mattress here.
  • Cocoon mattress by Sealy – a budget memory foam layer with PCMs in the cover.
  • Zotto Sleep mattress – one of the few mattresses that incorporate PCMs in the foam rather than the cover.

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