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UltraCool Comforter

Name: UltraCool Comforter
Brand: Slumber Cloud®
SKU: BED3413WHITE
Price: 207.2 USD
Availability: InStock
Rating: 4.6 (251 reviews)

Reduces Night Sweats Up To 50% Perfect For Couples Machine Washable

Select Size

Queen / Full

King / Cal King

Twin XL / Twin

Select Color

White

Select Weight

Lightweight

All-Season

Product Description

Introducing the UltraCool Comforter for a cool, comfortable sleep. Featuring cooling nylon/spandex and NASA-engineered fiberfill for year-round comfort. Comes in two-weights: Lightweight for the hottest sleepers and All-Season for those who prefer a little more weight.

Product Comparison

Features & Benefits

- Luxuriously silky soft and stretchy cooling nylon cover fabric

- Hypoallergenic, patented ClimaDry™ by Outlast fiberfill provides a down-like feel while regulating heat and moisture as you sleep

- Corner loops keep it in place if used as an insert inside a duvet cover

- OEKO-TEX® STANDARD 100 Certified Technology. Certification Number: SH025 151577 TESTEX

- Two fill weights to choose from: Lightweight for hot sleepers or All-Season for those who want more loft and weight

Materials

- 155 gsm 89% Cooling Nylon 11% Spandex Jersey outer cover

- 50% Outlast® ClimaDry polyester fiberfill / 50% polyester fiberfill

- 300 gsm fill weight for the All-Season option / 150 gsm for the Lightweight option

- 12" framed quilt boxing

Size Guide

Twin / Twin XL - 76" x 86"
Full / Queen - 90" x 98"
King / Cal-King - 108" x 98"

*For Cal-King mattresses simply rotate the comforter 90º

Care Instructions

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 1-3 months. Reduce wrinkles by removing this from the dryer immediately.

Free Shipping, Extended Holiday Returns, & Price Matches

Free Shipping: All U.S. orders are shipped right to your door, free of charge. Orders are typically shipped within 24 business hours.

Extended Holiday Risk Free Trial: Sleep on it, wash it, and really put it to the test until February 28th, 2026! If you don’t love your new bedding, just return it for a full refund. No questions asked!

Price Matches: Buy any Slumber Cloud item now. If it goes on a deeper sale within the next 60 days, just let us know and we'll refund the difference.

*Final Sale items and colors are not eligible for return, exchange, or the 60 Night Trial Period.

UltraCool Comforter

On Sale from $207.20

Why You'll Love It:

A cooling comforter that can be used all year long.

NASA-Engineered Comfort

The patented ClimaDry™ by Outlast fiberfill proactively regulates heat and moisture by absorbing, storing, and releasing heat.

Lab Proven Results

One of the highest Qmax values on the market (higher Qmax values = higher coolness feeling) - better than cotton, bamboo, silk, and lyocell.

Silky Soft Comfort

Featuring an 89% cooling nylon and 11% spandex outer cover, the UltraCool Comforter mimics the feeling of silk.

A better night’s sleep because of science.

It’s a fabric designed for NASA spacesuits up where temperatures change by 500 degrees. We think it can handle your bedroom.

How it works

The Only NASA Bedding

Our bedding utilizes Outlast®, the world’s only textile technology to have received the Certified Space Technology™ quality mark by the renowned Space Foundation.

Reduces Sweat By 50%

Our bedding provides proactive heat and moisture management, clinically proven to reduce night sweats by up to 50%.

Read the Outlast Humidity Sleep Study

Improves Deep Sleep By 20%

Our bedding adapts to the ideal temperature of both hot and cold sleepers, proven to decrease tossing & turning and increase sleep efficiency by 20%.

Read The Outlast Heat Sleep Study

"We replaced our down comforter with this and could not be happier. Really nice quality and keeps us nice an toasty without extra layers or being too heavy."

- Tina W.

"Love the fabric and really does feel cool to touch at night!"

- Lauren T.

Compare Our Products

Find the perfect solution for your needs

UltraCool Comforter

Cool-To-The-Touch Outer Fabric + Cooling Fill

Mid-Weight Fabric

Diamond Quilting Pattern

Recommend to use Without a Duvet Cover

Performance Cotton Comforter

Airy Breathable Cotton + Cooling Tech

Lightweight Fabric

Square Quilting Pattern

Recommend to use With a Duvet Cover

Textured Blanket - Final Sale

Eye-Catching Textured Design + Cooling Tech

Lightweight Fabric

Square Quilting Pattern

Recommend to use Without a Duvet Cover

	UltraCool Comforter	Performance Cotton Comforter	Textured Blanket - Final Sale
Outer Fabric	Cooling Nylon	100% Cotton	100% Textured Polyester
Fiber Fill	50% Outlast® ClimaDry polyester fiberfill / 50% polyester fiberfill	50% Outlast® ClimaDry polyester fiberfill / 50% polyester fiberfill	50% Outlast® ClimaDry polyester fiberfill / 50% polyester fiberfill
Colors	White, Navy, & Sand	White	Lunar & Pewter
Weight Options	Lightweight & All-Season	Lightweight & All-Season	Lightweight

Our Products

Outlast® PCM Technology

Proactive temperature management

Balances fluctuations in temperature

Phase change Materials

Brands Like Buffy & Cozy Earth

Moisture-Wicking Fabrics

Reactive Cooling

Works after sweat is produced

Bamboo, Eucalyptus, & Lyocell

Brands Like Parachute & Boll & Branch

Traditional Fabrics

Traps Heat & Moisture

Can cause overheating

Variety of weaves & hand feel

	Us	Moisture-Wicking Fabrics	Traditional Fabrics
Prevents Sweat Build-Up	✓	—	—
Manages Hot & Cold Sleepers' Needs	✓	—	—
Cool To The Touch	Exceptional	Moderate	Poor

FAQs

Does this product need to be paired with a duvet cover?

The UltraCool Comforter uses a premium outer cover fabric meaning pairing the UltraCool Comforter with a duvet cover is not necessary for temperature-regulation performance.

If you would prefer to use a duvet cover with the UltraCool Comforter it will regulate your temperature even when placed inside a duvet cover.

I sleep hot, my partner sleeps cold. Is this going to work for us?

Definitely! When you sleep hot but your partner sleeps cold we refer to this as being “thermally incompatible”. Our bedding is designed to automatically adjust to each sleeper’s ideal sleep temperature. With the unique ability to react to each sleeper's temperature independently, our bedding ensures that both you and your partner will sleep comfortably all night long.

What's the difference between the UltraCool Comforter, Lightweight Comforter, and Comforter?

Although all three comforter options are designed to help you sleep cooler and more comfortable, it's important to choose the version that best suits your sleeping needs. Below is a quick overview of each option to help you in this decision making:

UltraCool Comforter: A more traditional weight, the UltraCool Comforter pairs Outlast® temperature-regulation fiberfill with silky smooth outer fabric that is made of cooling nylon and spandex. The UltraCool Comforter is designed with 300 gsm fill weight – that of a traditional 3-season comforter but without the traditional heat build up. This comforter is the ideal choice for year-round use.

Lightweight Comforter: Our most popular comforter, the Lightweight Comforter uses Outlast® temperature-regulation fiberfill to regulate heat and humidity build up. Our thinnest option, this is best suited for "hot" sleepers who still want a little bit of weight on top of them.

Comforter: A twist on a classic comforter, this 3-season Comforter uses Outlast® temperature-regulation fiberfill to regulate heat and humidity build up. With a higher fillweight than the Lightweight Comforter the Comforter is ideal for those who need more of a 3-season weight or who prefer a bit more loft.

Does this come with cover loops or ties?

Yes, the UltraCool Comforter comes with cover loops.

Over 30,000 happy sleepers have spoken

We've helped over 30,000 sleepers unlock their best rest yet. See why customers and the press are calling our products a dream come true. Read all reviews

★ ★ ★ ★ ★

These sheets and duvet cover are so comfy and cozy! They really do keep me cooler at nights too; which I've been fighting with my entire life - I'm an overheater! I already recommended them to my best friend.

— Kristi M.

★ ★ ★ ★ ★

Perfect for California Summer! I love the lightweight and how well it regulates heat, so that we are not hot nor cold. It is perfection. I was hesitant because of the cost but glad that I decided to purchase it

— Esther B.

★ ★ ★ ★ ★

I have bought countless pillows, new bed, different positions, tried couch, bought new couch. Got this ultra cool pillow, so soft, literally feels like sleeping on a nice cool cloud. Slept the full night, first full night in over a year.

— Sagar J.