The airiest
Cloud Heaven Duvet
Tall, fluffy folds you can’t wait to get under.
From Was $1,239 now $739 Save $500
Free PureFlow cover + Lavender Pillow MistFree cover + pillow mist
Oversized King Comforters
Oversized king comforters, measured: King 112 × 98 in, Cal King 108 × 104 in, both about 18 in past each side of the mattress. All three premium down duvets come in both sizes, and the Cloud Heaven Duvet is the one with tall, fluffy folds you can't wait to get under.
Light as air
PureFlow Air Duvet
A lighter layer to curl into, for nights when you want less warmth.
From Was $889 now $529 Save $360
Free PureFlow cover + Lavender Pillow MistFree cover + pillow mist
Our rarest down
Royal Goose Down Duvet
Soft, lofty goose down to pull around you. Choose the warmth you love.
From Was $2,220 now $1,720 Save $500
Free PureFlow cover + Lavender Pillow MistFree cover + pillow mist
How far past my mattress will it reach?
Both of ours reach 18 in past each side of their mattress, laid flat. Oversized is a word, not a size, so read the inches, not the label.
If your last King left the mattress edge peeking out, it wasn't you. It was barely wider than the mattress, or the mattress was deeper than its reach.
Our two oversized sizes, laid flat
| King | Cal King | |
|---|---|---|
| Duvet | 112 × 98 in | 108 × 104 in |
| In cm | 285 × 250 | 275 × 265 |
| Mattress | 76 × 80 in | 72 × 84 in |
| Each side | 18 in | 18 in |
| Foot | 18 in | 20 in |
For head and foot placement, read our guide to oversized King duvet sizes. Every size we make is in the duvet size guide.
Will it still look short on a thick mattress?
Take your mattress thickness, topper included, away from 18 in: that is what is left past the side edge, laid flat. A 12 in mattress leaves 6 in, a 16 in one 2 in, before loft and the two of you take their share. Other beds and duvets are in our duvet sizes chart.
Free tool
Drape check
6 in to spare
A King duvet (112 × 98 in) on a King mattress (76 × 80 in) reaches 18 in past each side and 18 in past the foot, laid flat.
Laid flat, past the side of your 12 in mattress. Loft and sleepers use up some of that.
A Cal King duvet on the same mattress: 16 in past each side and 24 in past the foot.
Every answer, laid flat: sides, then foot.
- King mattress. King duvet 18 in and 18 in. Cal King duvet 16 in and 24 in.
- Cal King mattress. Cal King duvet 18 in and 20 in. King duvet 20 in and 14 in.
Take your mattress thickness away from the side figure.
King or Cal King: which one is yours?
Buy the one named for your mattress. An oversized California King comforter needs length: a King duvet on a Cal King mattress gets 20 in at the sides but only 14 in at the foot.
Unsure which mattress you have? See King vs California King duvets.
What comes with each duvet?
- The duvet: a comforter made to live inside a cover. 100% Canadian down in our patented Cloud Shell: 800+ fill power in Heaven and Air, 900+ in Royal, our highest. The frame is split at the head, foot and sides, so the down stays even and each sleeper keeps a full share.
- A PureFlow Duvet Cover in the same size, free for a limited time, with eight ties that hold the duvet square. Plus a free Lavender Pillow Mist.
- Free shipping to the US and Canada and 60 nights to try it, with free returns. You can exchange King for Cal King, with any price difference settled. See shipping and returns.
- The 5 year Loft Promise on Heaven and Air. Royal has its own 5 year warranty.
In King: Cloud Heaven Duvet $769, PureFlow Air Duvet $579, Royal Goose Down Duvet $1,920. In Cal King: $799, $629 and $2,020. Code LOVE takes $150 off orders of $500 or more, so a King Cloud Heaven Duvet comes to $619.
Questions people ask
What is an oversized king comforter called?
Oversized, jumbo or XL king, depending on the shop. None of those names is a fixed size, so check the inches. Ours are King and Cal King, cut generous.
Is an oversized king the same as a California King?
No. A California King is a mattress, 72 × 84 in: narrower and longer than a King at 76 × 80 in. We cut a duvet for each.
Can I machine wash an oversized King?
Yes, cold and gentle with a mild down wash, then low heat with dryer balls until completely dry. If it crowds your machine, use a suitable larger washer and dryer. See our duvet care guide.
Do you sell oversized king comforter sets?
Yes. The Cloud Heaven Sleep Set adds two pillows and two pillowcases, $969 in King. The Royal Goose Down Sleep Set is $2,520 in King. Or compare all sets.
My mattress is 16 in or deeper. Should I buy something wider?
Only if you want more fabric at the sides. The Company Store lists its oversized King/Cal King at 116 × 96 in. On a King mattress that is 2 in more than ours at each side and 2 in less at the foot. On a Cal King it gives 22 in at the sides and 12 in at the foot, to our 18 and 20. A bed skirt or a rising frame hides the seam whatever you buy.
How we worked these out: side reach is duvet width minus mattress width, halved; foot reach is the length difference, top edges level, laid flat. Sizes from our size guide, US prices read 13 Nov 2026. How we compared: we read The Company Store's own listing on 13 Nov 2026 and lined up size. We have not tested the other products. YumeFeel is our own brand.
