Oversized Duvet Cover: Sizing for Alaskan, Wyoming & Texas King

You sorted out the sheets for your Alaskan or Wyoming King, then put a King duvet on top and it just sits there like a napkin on a dinner table, floating in the middle with bare mattress showing all around. A standard duvet was built for a 76-inch bed, and your bed is a foot or more wider than that. What you need is an oversized duvet cover actually cut for the bed you own. Here's how to get the right one.

Why a standard King duvet won't work

A duvet cover is supposed to drape over the sides of the bed, not just cap the top. A King cover is sized for a 76-inch-wide mattress, and it's built to hang a bit past that on each side. Put it on an Alaskan King, which is 108 inches wide, and it can't even reach the edges, let alone drape. You get a small rectangle of bedding stranded in the center with bare mattress framing it. The whole look falls apart, and on cold nights the covered area doesn't even keep you warm to the edges.

This is the same fit problem behind oversized sheets, just on top of the bed instead of around it. If you already sorted your oversized King sheets, the oversized duvet cover is the piece that finishes the bed.

Match the cover to your bed

Oversized isn't one size, it's a family of them, so the first job is knowing which bed you have. If you're not sure, our guide to Alaskan vs Wyoming vs Texas King sorts it out. Then match it to the cover size:

The jump from King to Oversized King to Super Oversized King is exactly what lets the cover drape past the sides again instead of stopping short. Buy the name that matches your bed and the guesswork disappears.

See the gap for yourself

Here's what a King duvet actually looks like on an Alaskan King bed. The shaded frame is bare mattress no cover reaches:

The insert has to be oversized too

One thing people miss: the cover and the insert are two separate pieces, and both have to fit the bed. An oversized cover with a plain King comforter stuffed inside still leaves the filling bunched in the middle with empty cover around the edges. When you size up the cover, size up the insert or comforter to match, so the fill actually reaches the corners and the bed looks full and even.

While you're dressing the bed, the layer underneath counts too. An oversized mattress needs a protector that reaches its corners just like the sheets and cover do, so a standard one won't hold. SGI's oversized mattress protector is cut to the same big-bed sizes, which rounds out the full set from the mattress up.

Fabric and feel

A duvet cover is the largest single piece of fabric on the bed, so its feel sets the tone for the whole room. SGI's oversized covers are 1000 thread count long-staple cotton with a pinch-pleat face, which gives a soft, structured, hotel-bed look that dresses up a big bed rather than swamping it. It comes in nine colors, from clean White and Ivory-toned Butter through to deeper Navy Blue, Burgundy, and Black, so it works with a calm or a bold bedroom. For the broader rundown on duvet fabrics, sizes, and how to put one on, see our complete duvet cover guide.

Our Pick

1000 Thread Count Pinch Pleat Duvet Cover

• King/CalKing, Oversized King, and Super Oversized King
• 1000 thread count long-staple cotton
• Nine colors, pinch-pleat hotel look

From $91.99

Shop the cover

Keeping an oversized cover looking sharp

A cover this size takes up a lot of a washing machine, so don't force it in with a full load or it won't rinse clean. Wash it warm or cool on its own, skip fabric softener, and tumble dry low. Take it out slightly damp and shake it out over the bed, which saves you ironing a piece the size of a small tent. Doing up the closure before you wash keeps the cover from twisting around the insert in the drum.

A few common questions

What size duvet cover fits an Alaskan King bed?

A Super Oversized King. An Alaskan King mattress is 108 by 108 inches, far past what a standard King cover can drape over, so it needs the largest oversized size.

Will a King duvet cover fit a Wyoming or Texas King?

No. Both are wider than a standard King, so a King cover stops short of the edges. A Wyoming King (84 by 84) and a Texas King (80 by 98) both take an Oversized King cover.

Do I need an oversized insert as well as an oversized cover?

Yes, if you want the bed to look full. A cover and insert are separate pieces, and a standard insert inside an oversized cover leaves the fill bunched in the middle. Size both to the bed.

What if my oversized bed is an unusual size?

Measure the mattress and match it to the closest oversized cover size. If it falls outside the named sizes, ask about a custom cut rather than settling for one that doesn't drape.