Twin Extra Long Down Comforters & Duvet Inserts

Twin/Twin XL

Does your bedding have you snoring (and we don't mean it in a good way)? If your comforter isn't making you cozy in style, it might be time for a refresher in your restful retreat. A soft duvet like this is a great option for snuggling up while you drift off to dreamland. A polyester filling rounds this piece out with a warm touch that can be used year-round. It's also completely hypoallergenic, thanks to its microfiber components! And since it's machine washable, when this piece needs a pick-me-up, simply give it a quick cycle and tumble dry.

I love it thank u so much it’s sooo soft and it makes my room more comfortable and cozy. Looks sooo good with my home design and decor. Will be buying more. Brandon. Buddy. Sun Jan 11 2026

Twin/Twin XL

Give your favorite duvet cover a fresh new fill with this must-have plush insert. Ideal for those with allergies, this down-alternative design is made from hypoallergenic microfiber polyester that won't cause sneezing or irritate the skin. A baffle-box construction allows for an even distribution of fill, so that this piece is equally warm all over without bunching. It's an all-season design that can be used year-round. And a neutral white hue means it effortlessly blends with any cover without showing through. It's even machine-washable for quick and easy cleaning – and it's perfect for any bedroom.

I have never owned a duvet, always just comforters. This is wonderfully soft and pretty light weight but kept me comfortable all night. I wasn’t too hot or too cold…just right. The duvet cover I bought had ties for the top bottom and sides, but the insert only has loops on the corners. Being a king size I wish it had more loops but as of right now it has worked nicely.. Michelle. US. Sat May 02 2026

King

Turn your bed into a cloud of comfort with this Summer Down Alternative Comforter. This comforter is filled with high-quality down-alternative fill, and with a 400 GSM fill, this microfiber duvet is ultra-thick. You'll be thankful for this bedding as you go to sleep each night. It is inspired by pure overindulgence. Designed around the concept of over-the-top comfort, this combines every element you would want in a comforter. Starting with the outer material, a pre-washed microfiber that gives new meaning to the term 'perfection'... it is impossible to touch this material and not have your expectations exceeded. Next, is the inner filling, a 400 GSM ultra-thick, yet light and cozy, down alternative filling that provides that highly sought-after combination of warmth without overheating. This cloud-like ultra-thick comforter is machine washable - which is essential to keeping your bedding clean and refreshed. All elements; cozy soft outer material and thick plush inner filling combine in comforter perfection.

I knew when I saw the box that said “coma-inducer” that I made the right choice. As an interior designer, I highly recommend it and I’m obsessed with it. It’s oversized which I love aesthetically. I also love that it’s suitable for every season, so it’s not going to be too hot in the summer but yet it’s also perfectly warm in the winter. It’s cloud-level comfort.. Danielle. Milton, VT. Sat Mar 07 2026

Twin XL

Mary Lee. Thu Dec 04 2025

Twin XL

Achieve the comfortable sleep you desire with the Sleep Philosophy Oversized Microfiber Comforter with HeiQ Smart Temp Treatment. This down alternative comforter uses a temp regulating treatment to help maintain a balanced temperature by retaining body heat when you’re cold or wicking away moisture to cool you off when you’re hot. This treatment makes the microfiber comforter perfect for year-round use and comfort. Oversized to fit extra-deep mattresses, this comforter insert has classic diamond quilting with loops stitched on the corners to hold duvet covers in place. The comforter is also OEKO-TEX certified, meaning it does not contain any harmful substances or chemicals to ensure quality comfort and wellness.

Twin / Twin XL

Get yourself the ideal comforter to keep you cozy all year round. This premium soft oversized lightweight all-season down alternative comforter is perfect for all seasons. These comforters are designed to keep you either warm or cool depending on the season. In addition to amazing sleep, the comforters are 100% hypoallergenic and perfect for allergy sufferers. Lastly, the box stitching eliminates the need for regular fluffing. Upgrade today.

My son fell loves it and it is very soft. Anonymous. Wed Sep 13 2023

Twin XL

Twin / Twin XL

Get yourself the ideal comforter to keep you cozy all year round. This ultra soft lightweight season-down alternative comforter is perfect for all seasons. These comforters are designed to keep you either warm or cool depending on the season. In addition to amazing sleep, the comforters are 100% hypoallergenic and perfect for allergy sufferers. Lastly, the box stitching eliminates the need for regular fluffing.

Does what I wanted...not too hot!!. Caroline. US. Wed Aug 31 2022

Twin XL

Twin Extra Long

Wrap yourself in comfort with this oversized plump thick pink duvet (229*229cm)! Boasting enhanced warmth and skin-friendly fabric, it’s perfect for cozy bedrooms and luxury hotels. Machine washable for easy care, it also serves as an ideal Christmas gift, blending practicality with festive charm.

Twin Extra Long, White

Experience the ultimate comfort and convenience with the Serta Comfort Sure Rest Down Alternative Comforter. This duvet insert is perfect for all seasons with its year-round warmth and box stitch quilting. Clean and Fresh, this fabric inhibits the growth of unpleasant odors, ensuring that your comforter stays fresh and clean for longer periods. The 4 corner loops keep the duvet insert securely in place, preventing shifting and bunching. The down alternative filling provides the same cozy feel as down, without the feathers. Machine washable for easier maintenance and convenience. Upgrade your bedding experience with the Serta Comfort Sure Rest Down Alternative Comforter.

Perfect liteweight summer insert. Connie. Silverton, OR. Sun May 19 2024

Twin Extra Long

Discover unparalleled comfort with our Lightweight 100% Cotton Summer Blanket, meticulously designed for those balmy nights. Crafted from crisp cambric cotton with a luxurious 230 thread count, this blanket ensures a soft and breathable experience, perfect for warm weather use. Our innovative Continuous Comfort fiber filling, now GRS certified, offers a hypoallergenic alternative to traditional down, providing cozy yet lightweight warmth. Each blanket features expertly sewn-through box construction, boasting 10" quilting complemented by a 5-inch frame/border, ensuring the filling remains evenly distributed with no shift (The filling on the outer border can shift to allow for custom comfort). The inclusion of convenient duvet tabs at each corner allows for easy attachment to your duvet cover, preventing the blanket from shifting inside. Proudly filled and finished in the USA with minimal packaging, our blanket echoes the commitment to quality and sustainability, just like the products we supply to hotels. It is easy to care for, being machine washable and dryable, and is made of fabric from China with filling sourced from the USA. Will the Continuous Comfort filling feel similar to EnviroLoft? It delivers the same plush comfort. Is this blanket suitable for warmer climates? Yes, its design is ideal for those seeking a blanket that provides warmth without the weight of a traditional comforter.

Absolutely love this comforter. Just like the one in a luxury hotel.. Anonymous. Tue May 06 2025

Twin Extra Long

Used by the finest hotels and resorts and soon to be gracing your home. Designed to work with a duvet cover if you want with 4 corner loops for attachment. Or, skip the duvet cover and use it by itself with its crisp white fabric. Medium weight comforter great for year-round comfort. Rest assured hypoallergenic filling processed.

Super comfy. Kept me warm, but it didn’t make me too hot. Anonymous. Sat Dec 20 2025

Twin XL (68" x 90")

Enjoy cozy comfort with this down alternative comforter. The microfiber cover feels luxuriously soft , while the baffle box construction keeps the polyester fill evenly distributed for a consistently cozy sleep experience. Perfect for year-round use.

Was okay but looked a little flat.... using in my guest bedroom!. Louise. Bella Vista, AR. Mon Jan 12 2026

Twin/Twin XL

Inspired by our favorite winter jackets, the Casper R&D team (the same one behind our award-winning mattress) created the down duvet for enjoying the great indoors. Designed for year-round use, the down duvet uses naturally insulating duck-down clusters to keep you comfortable and cozy. The carefully considered construction of the down duvet was proven to optimize your body's natural temperature regulation - keeping you comfortable from dusk until dawn. The rectangular chambers drape perfectly across your body, while the seams prevent any fill from migrating. Combined with our highly breathable outer cotton shell, the down duvet insulates your body without trapping body heat. Lastly, the down duvet was no different when it came to Casper's signature attention to detail. Discreet tags on either end help identify the head and foot of the duvet, while loops in each corner help keep it in place within your cover.

Love the weight of this duvet. It keeps me super warm.. Jennifer. Los Angeles, CA. Tue Dec 23 2025

Twin XL

Perfect size. Perfect weight. Very lightweight and Perfect for all seasons.. Angela. IN. Sat May 17 2025