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Core Down Alternative Pillow

Name: Core Down Alternative Pillow
Brand: Slumber Cloud®
SKU: BED2702
Price: 71.2 USD
Availability: InStock
Rating: 4.4 (595 reviews)

Hypoallergenic Fill Made In USA NASA Cooling Technology

Product Description

Upgrade your sleep with our Core Down Alternative Pillow. Infused with NASA-engineered tech, it offers unmatched support and softness for ultimate comfort.

Product Comparison

Features & Benefits

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

- Filled in the USA

- Two firmness levels for perfect neck support

- OEKO-TEX® STANDARD 100 Certified Technology. Certification Number: 05.0.9235

Materials

- 300 thread count, 100% cotton outer cover

- 100% polyester non-woven lining with Outlast® Technology coating

- 100% down alternative polyester fiberfill

Size Guide

Standard - 20” x 26”
King - 20” x 36”

Care Instructions

Basic Care:
Machine wash cold water on a gentle cycle with a mild detergent, and with like colors only. For best results use a front load washer. Only use non-chlorine bleach when needed. Tumble dry low heat until completely dry. Remove from dryer immediately and fluff after drying. Do not iron.

Pro Tip:
Pillows should be washed 2-4 times a year. For best results use a front load washer. When drying, use wool dryer balls to reduce dry time and improve fluffing.

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.

Core Down Alternative Pillow

On Sale from $71.20

Why You'll Love It:

Thoughtful details, inside and out.

Filled With The Good Stuff

Our Polysilk™ down alternative fiberfill mimics down without heat buildup, offering advanced comfort without hassle.

Good Enough For NASA

Built with NASA-engineered material that absorbs, stores, and releases excess heat to regulate temperature for optimal comfort all night.

Supportive Sleep

Choose Soft/Medium or Medium/Firm firmness options tailored for stomach, side, or back sleepers, ensuring ideal support for every sleeping style.

The Slumber Cloud Core Down Alternative Pillow with Outlast® temperature regulation technology to help keep you cool and comfortable throughout the night

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

"Absolutely love these pillows. They are AS ADVERTISED! Super cool. Super soft. The quality is obvious the moment you take them out of the packaging."

- John M.

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

- Lauren T.

Compare Our Products

Find the perfect solution for your needs

Core Down Alternative Pillow

	Core Down Alternative Pillow

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

I need a new pillow, what firmness is best for me?

Pick your firmness based on your typical sleeping position. The soft-medium pillow offers the perfect support for those that prefer to sleep on their stomach and back. The medium-firm pillow is recommended for those who regularly sleep on their side and back.

Can I put a pillowcase over my pillow?

Yes, we want your bed to look nice and match the rest of your linens so we made sure the technology inside our pillows will still work even when used with a pillowcase.

Should I use a pillow cover with my pillow?

We highly recommend using a pillow cover with your pillow. A pillow cover will reduce the wash frequency of your pillow and improve the product lifetime.

Which one is cooler, the UltraCool or Core Down Alternative pillow?

True to its name, the UltraCool pillow is going to be the "cooler" of the two pillow options. Although you will still get great temperature control with the Core Down Alternative Pillow, this is designed more for sleepers would prefer a traditional pillow with a modern temperature-regulation technology added in.

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.