A duvet insert is the fluffy, quilted blanket that keeps you warm. A duvet cover (like our Helix Cotton Blend Duvet Cover Set) goes over the insert to protect it and make it easy to wash. Together, they create a complete, customizable sleep system. You can swap out covers to match your style or season without replacing the whole duvet.

Comforters and duvets are pretty similar: they are both cozy, quilted, filled blankets that keep your bed warm. The main difference between a duvet and a comforter is whether or not you’re supposed to use them with a cover. Comforters are typically designed to be used alone and might have designed or colored fabric to indicate that, while duvets have two separate pieces: the cover, and the insert. That said, some people may decide to put a duvet over their comforter for added protection and warmth.

As an alternative to goose down, which can be fluffy but cause allergy issues, we opted for premium 3D thermal bonded fiber for our Down Alternative Duvet Insert. 3D thermal bonded fiber has a similar cushiony, smooth texture to high-quality polyester fill, but it resists clumping and bunching which can be an issue with polyester. It has a crimped or spiraled 3D structure, which gives it a light and bouncy loft without feeling too heavy or packed down over time. The texture also has a hollow design so air can flow freely, helping it naturally regulate temperatures without a clammy feeling.

Our down alternative duvet insert is designed to be warm without making you overheat. 3D thermal bonded fiber has a crimped, curly texture with hollow channels to allow air to flow freely and naturally regulate your temperature. The 280 thread-count 100% cotton percale shell is also breathable and soft for all-season comfort.

GSM stands for grams per square meter, which is how we measure the weight of an insert’s fill, aka how thick and warm it is. As a general rule of thumb, the higher the GSM, the warmer a duvet insert will be. Below 250 GSM is lighter weight, and great for warmer temperatures. Higher than 400 GSM is quite dense and heavy, and recommended for very cold weather. Our Premium Down Alternative Duvet Insert has 250 GSM, so it’s right at the sweet spot for a cool, cozy night of sleep.

Go ahead and give your duvet insert a try: you have 30 nights to sleep with it and see if you like it. If it’s not a perfect fit, we’re happy to offer a quick, easy exchange or return. Just send us an email at help@helixsleep.com and we’ll get right back to you.

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The Down Alternative Duvet Insert is made in China.