Oversized King Sheets: How to Fit an Alaskan, Wyoming, or Texas King Bed

You splurged on an Alaskan King, and now the bed of your dreams has turned into a laundry-day headache. The fitted sheet from your old King pops off at 3 a.m., and every big-box store looks at you blankly when you ask for something that covers 108 inches. Finding oversized king sheets that actually stay on is the one thing nobody warns you about before you buy an oversized bed.

Why your standard King sheets don't fit

Here's the trap: everything with "King" in the name sounds interchangeable, but these are completely different beds. A standard King is 76 inches wide by 80 inches long. An Alaskan King is 108 by 108, which is nearly three feet wider and more than two feet longer. Stretch a standard fitted sheet over a bed that much bigger and the corners simply cannot reach. Even if you wrestle it on, it slips off the moment you move.

A California King doesn't solve it either. People assume Cal King is "the big one," but at 72 by 84 it's actually narrower than a standard King, just longer. If you're curious how those two compare, our California King sheets guide breaks it down. For a true oversized bed, none of the off-the-shelf sizes work. That's the whole reason oversized king sheets exist as their own category.

The oversized king sizes, measured

Before you order a single sheet, confirm which bed you actually own. Here's how the oversized sizes stack up against the standard ones:

SGI cuts sheets for all of these, plus a few sizes most brands never touch, like Short Alaskan King, Family King, and Family XL. Those family sizes vary a bit from maker to maker, so if you own one it's worth measuring your mattress and matching it to the size chart rather than guessing.

What to look for in oversized king sheets

• ✓Cut to your exact size. A fitted sheet labeled for your specific oversized size, not a "stretches to fit" standard sheet that never really does.
• ✓Deep pockets. Oversized mattresses are often thick or stacked on a topper. Look for pockets that clear 15 inches so the elastic grips underneath instead of riding up.
• ✓Breathable fabric. More surface area and more bodies means more trapped heat. A cooling weave matters more on a big bed than a small one.
• ✓A matching flat sheet and pillowcases. Standard King pillowcases are fine, but the flat sheet has to scale up with the bed or it won't tuck.

Cotton or bamboo for a bed this big?

Both work, and the right pick comes down to how you sleep. A bed with two adults and a kid or two runs warm, and that's where bamboo earns its keep. It wicks moisture and sleeps cooler than cotton, so it's the smart default for Alaskan King sheets and other family-sized beds. If you tend to sleep hot, start with our roundup of the best bamboo sheets and note that the odd-size range is where SGI stands apart.

Cotton is the classic choice if you like a crisp, hotel feel and don't run especially warm. Either way, the fabric matters less than the fit. A gorgeous cotton set in the wrong size is still a set that slides off the corners.

Our Pick

100% Bamboo Viscose Oversized Sheet Set

• Wyoming, Texas, Alberta, Alaskan, Short Alaskan, Family King and Family XL
• Cooling bamboo viscose, built for warm family beds
• Deep-pocket fitted sheet cut to the exact size

From $114.99

Shop the set

Don't forget the duvet and the protector

Sheets are only half the bed. A standard King duvet cover leaves an oversized comforter hanging off one side, so you'll want a cover in the right scale too. SGI's cotton duvet covers come in Oversized King and Super Oversized King, in both the 1000 thread count pinch pleat duvet cover at $91.99 and a lighter 600 thread count version at $76.99. Both are 100% cotton in nine colors.

And because a big mattress is a big investment, an oversized mattress protector ($44.99) cut to the same sizes is the cheap insurance that keeps spills and stains from reaching it.

Own an odd size? Go custom

Some oversized beds, especially custom-built or antique frames, don't match any named size. If your mattress falls between the standard oversized dimensions, the 600 thread count custom size sheet set ($124.99) is made to your measurements. Grab a tape measure, note width, length, and mattress depth, and you get a set that fits like it was born on the bed, because it was.

Caring for oversized king sheets

Big sheets need a little more room to breathe in the wash. Use a cold or warm cycle, skip the overloaded machine (a stuffed drum won't rinse an Alaskan King flat sheet properly), and tumble dry low. Bamboo especially prefers gentle heat, which also keeps the fibers soft over time. Pull them out slightly damp and they'll finish smooth with barely any wrinkling. If you can, keep two sets in rotation so laundry day never leaves the bed bare.

A few common questions

Do regular King sheets fit an Alaskan King bed?

No. A standard King is 76 by 80 inches and an Alaskan King is 108 by 108, so a regular fitted sheet can't reach the corners. You need Alaskan King sheets cut to the full size.

What size sheets do I need for a Wyoming King?

A Wyoming King is 84 by 84 inches, squarer than a standard King. Look specifically for Wyoming King sheets, since neither King nor California King sheets will match that footprint.

Are Texas King and Alaskan King the same?

No. A Texas King is 80 by 98 inches, built for length, while an Alaskan King is 108 by 108, built for overall space. Texas King sheets and Alaskan King sheets are different cuts, so order by your exact bed.

Where can I buy oversized king bedding that fits?

SGI specializes in it. You can browse every oversized cut, from Wyoming to Alaskan, in the oversized bed sheets collection, or go custom if your bed is a one-off.