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Slumber Cloud

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UltraCool Pillow

Reviews+30k verified reviews
Select Size· Standard
Select Firmness· Soft/Medium
Quantity
$80.00$218.00

Limited-time sale price — you save $138 on this 2-pack

Free US shipping & 30-night trial

Overview
Discover the ultimate sleep solution with our NASA-engineered UltraCool Pillow. Named "Best Cooling Pillow" by Good Housekeeping, it features premium Outlast® technology that actively regulates temperature throughout the night. Choose from two firmness levels for perfect neck support while reducing heat buildup by up to 50%. Experience cooler, deeper sleep tonight.
Features & Benefits

NASA engineered

Premium NASA-engineered Outlast® fabric on both sides fights off heat.

Two firmness levels

Two firmness levels allow for perfect neck support.

Adaptive cooling

Designed to manage heat through your pillowcase.

Materials, Fabric Technology & Care

What it is made from

  • 100% polyester knit outer cover with Outlast® Technology coating
  • 100% down-alternative polyester fiberfill

How the fabric works

  • Premium NASA-engineered Outlast® fabric on both sides fights off heat.
  • Two firmness levels allow for perfect neck support.
  • Designed to manage heat through your pillowcase.
  • OEKO-TEX® STANDARD 100 Certified Technology. Certification Number: 05.0.9235

How to care for it

Basic Care: Machine wash cold water on a gentle cycle with a mild detergent and with like colors only. Do not use fabric softener. Only use non-chlorine bleach when needed. Tumble dry low heat until completely dry. Remove from dryer immediately. Do not dry clean. Do not iron.

Pro Tip: Wash this every 2-4 times a year. Keep your pillows fluffy by drying your pillow with tennis balls or dryer balls.

Sizing & Dimensions

Standard - 20” x 26” King - 20” x 36”

Shipping, Returns & Price Match

Free US ground shipping — orders typically ship within 24 business hours from Denver, Colorado. Try it for 30 nights; if you don't love it, return it for a full refund. If it goes on a deeper sale within 30 days, we'll refund the difference.

Made for cooler, deeper sleep

Why you'll love it

NASA engineeredPremium NASA-engineered Outlast® fabric on both sides fights off heat.
Two firmness levelsTwo firmness levels allow for perfect neck support.
Adaptive coolingDesigned to manage heat through your pillowcase.
UltraCool Pillow

Inside the product

Materials chosen for cooler, more comfortable sleep.

From what touches your skin to how it performs overnight, every detail below comes directly from this product’s materials and care information.

01

Materials

  • 100% polyester knit outer cover with Outlast® Technology coating
  • 100% down-alternative polyester fiberfill
02

Technology & benefits

  • Premium NASA-engineered Outlast® fabric on both sides fights off heat.
  • Two firmness levels allow for perfect neck support.
  • Designed to manage heat through your pillowcase.
  • OEKO-TEX® STANDARD 100 Certified Technology. Certification Number: 05.0.9235
03

Care

Basic Care: Machine wash cold water on a gentle cycle with a mild detergent and with like colors only. Do not use fabric softener. Only use non-chlorine bleach when needed. Tumble dry low heat until completely dry. Remove from dryer immediately. Do not dry clean. Do not iron.

Pro Tip: Wash this every 2-4 times a year. Keep your pillows fluffy by drying your pillow with tennis balls or dryer balls.

What the press says

“For truly hot sleepers, leave it to NASA engineering to figure out a way to help you finally stay cool at night.”

— Real Simple

The only NASA-derived bedding

Outlast® technology, originally developed for NASA

Award-winning sleep

Recognized by sleep and home editors

Independently lab tested

Improves sleep by 20%, reduces sweat by 50%

Verified Yotpo reviews

Real ratings from 30K+ sleepers

Good to know

Frequently asked questions

How does this bedding help with temperature?

Outlast® phase-change material absorbs excess body heat as you warm and releases it back as your temperature drops.

Can I wash it at home?

Yes. Follow the care instructions above for this product and avoid high heat to protect the fabric and temperature-regulating finish.

What if it is not right for me?

Eligible products include free US returns and a 30 night risk-free trial, so you can wash it, sleep on it and put it to the test.

Real sleepers, real results

Customer reviews

+30k verified reviews, powered by Yotpo.

Waking up rested in Slumber Cloud bedding

Tested, not just claimed

Independent sleep testing on Outlast® bedding.

50%

reduction in sweat

20%

improvement in sleep

30K+

happy sleepers