I love the look and feel of down but didn't want feathers. This gives me the same fluffy, cozy feeling without any of the things I don't like about down.
This is the kind of comforter you want to stay in bed for. It's incredibly fluffy and cozy but somehow still feels light instead of heavy.
CloudFill Duvet Insert
$79.99
$119.99
Savings based on comparable value.Learn more
Pricing Disclosure
The listed comparable value represents the manufacturer's suggested retail price or the average retail price of similar products with comparable features, materials, and construction available from major retailers at the time of listing. Mellow's sale price reflects our direct-to-consumer pricing model, which eliminates traditional retail markups. Comparable values are reviewed periodically and may not reflect real-time pricing from all retailers.
30-Day Trial
Hassle-Free Returns
Overview
Materials
Care
FAQ
This is the kind of comforter you want to stay in bed for. It's incredibly fluffy and cozy but somehow still feels light instead of heavy.
Meet the Down Alternative That Does More.
All the fluffy, cozy comfort you want from premium down, reengineered to stay lofty, breathable, and incredibly lightweight night after night.
CloudFill™ That Actually Stays Fluffy
Ultra-fine CloudFill™ fiber clusters mimic the airy structure of premium goose down while rebounding quickly after compression. Unlike traditional fills that can flatten and clump over time, CloudFill™ is engineered to maintain its cloud-like loft and evenly distributed comfort.
Warm Without the Weight
Our handcrafted 3D Air Chamber Construction creates insulated pockets that hold warmth close while allowing excess body heat and moisture to escape. You get that perfectly cozy, tucked-in feeling without waking up overheated or weighed down.
All the Luxury. None of the Feathers.
Get the lofty look and plush feel of premium down without feathers, quills, odors, or fill leakage. CloudFill™ delivers consistently fluffy, clean comfort that's easy to care for and made for everyday sleep.
The Science Behind the Fluff
CloudFill™ Biomimetic Fiber
Inspired by the structure of premium goose down, ultra-fine microfiber clusters create exceptional loft while resisting flattening and clumping. The result? A comforter that stays ridiculously fluffy.
3D Air Chamber Construction
Individual air chambers help trap cozy warmth while releasing excess heat and moisture, creating balanced, breathable comfort throughout the night.
Frequently Asked Questions
What makes CloudFill™ different from a traditional down alternative comforter?
CloudFill™ uses specially engineered ultra-fine microfiber clusters designed to mimic the airy, lofty structure of premium goose down. The fibers rebound quickly after compression and resist clumping and flattening for longer-lasting fluff.
Is the CloudFill™ Duvet Insert good for hot sleepers?
CloudFill™ is designed for balanced temperature control. Its 3D Air Chamber Construction retains comfortable warmth while allowing excess heat and moisture to escape, helping you stay cozy without feeling overly hot.
Does CloudFill™ contain real down or feathers?
No. CloudFill™ is completely feather-free. You get the fluffy loft and luxurious feel associated with premium down without feathers, quills, odors, or fill leakage.
Can I use the CloudFill™ Duvet Insert year-round?
Yes. CloudFill™ combines lightweight warmth with breathable construction, making it designed for comfortable use throughout the seasons.
Will the fill clump or flatten over time?
CloudFill™ fibers are specifically engineered for fast rebound and lasting resilience. The handcrafted box construction also helps keep the fill evenly distributed throughout the duvet.
Is the CloudFill™ Duvet Insert machine washable?
Yes. Machine wash cold separately only when necessary and tumble dry low. Fluff thoroughly after washing to help restore its maximum cloud-like loft.
Is CloudFill™ OEKO-TEX® Certified?
Yes. The CloudFill™ Duvet Insert uses OEKO-TEX® Certified materials.
Trusted By Thousands Of Happy Sleepers
Real people are sleeping deeper, cooler, and more comfortably with mellow.
0%
of mellow customers sleep at their ideal temperature
0%
would recommend mellow to their family and friends
0%
of mellow customers have left 5 star reviews
Complete Your Sleep Routine
A calming routine is only the beginning. Pair it with pillows and bedding that make it easy to relax, unwind, and sleep soundly through the night.
MellowSoft Duvet Set
Ultra-soft, breathable duvet set made from premium regenerated fibers with a brushed finish, hidden zipper closure, corner ties, and machine-washable everyday comfort.
$74.99
$79.99
SAVE $5
CloudAlign Pillow
The #1 best-selling ergonomic pillow of 2025, engineered to support proper alignment, relieve neck and shoulder pressure, and help you sleep deeper.
$49.99
$100
SAVE $50.01
BESTSELLER
CloudCool Cooling Sheet Set
The Mellow Cooling Sheet Set is made from buttery-soft cooling fibers that instantly pull heat away from your body while releasing excess moisture for a cooler, deeper sleep.
$82.99
$106.99
SAVE $24