You found the mattress. A Wyoming King, or maybe the giant Alaskan King that turns a bedroom into an event. Then you went to buy sheets, and every shop quietly stopped at King. That is the part nobody warns you about: finding Alaskan King sheets that actually fit is harder than finding the bed. It is also exactly the gap SGI was built to close.
Why standard King sheets never fit an oversized bed
A regular King mattress is 76" wide by 80" long. Every oversized King is bigger in at least one direction, and most are bigger in both. A Wyoming King adds 8 inches of width. A Texas King keeps a normal-ish width but stretches to 98 inches long for tall sleepers. An Alaskan King is a 9-foot square. Stretch a King fitted sheet over any of them and the corners pop off by morning, the flat sheet leaves a foot of mattress bare, and the whole thing looks and feels wrong.
This is why oversized bedding is a category of its own, not a stretch of the standard sizes. The pocket depth, the flat-sheet drop, and the finished width all have to be built for the real mattress. If you have shopped standard sizes before, our king size bed sheets guide covers the regular King, and the California King sheets guide explains why even Cal King (72" x 84") is a different cut. Oversized Kings are simply the next step out.
Oversized King sizes, side by side
Before you buy oversized King sheets, confirm which size your mattress actually is. The names sound similar but the dimensions are not close.
| Size | Dimensions | Best for |
|---|---|---|
| Standard King | 76" x 80" | Reference point, not oversized |
| Wyoming King | 84" x 84" | Couples wanting a little more room, one co-sleeping child |
| Texas King | 80" x 98" | Very tall sleepers who need the extra length |
| Alberta King | 96" x 96" | Families who want more than a Wyoming, less than an Alaskan |
| Alaskan King | 108" x 108" | Large co-sleeping families and maximum space |
SGI also cuts sheets for Short Alaskan King, Family King, and Family XL, so if your mattress carries one of those names you are still covered. Measure the mattress yourself before ordering; a tape measure across the widest and longest points settles any doubt about which oversized bedding size to pick.
Bamboo or cotton for your oversized King?
SGI gives you two honest ways to dress an oversized bed, and the right one depends on how you sleep.
- ✓Bamboo, for hot sleepers. The bamboo oversized sheet set comes ready-made in Wyoming, Texas, Alberta, Short Alaskan, Family King, Family XL, and Alaskan King. Bamboo viscose breathes and wicks moisture, which matters when a bigger bed means more body heat trapped under the covers.
- ✓Cotton, cut to any measurement. If your mattress is an odd size or you simply prefer the crisp feel of cotton, the 600 thread count custom-size cotton set is sewn to the exact width, length, and depth you give us. Nothing off the shelf, no guessing.
Both come with deep pockets built for thick oversized mattresses, and both ship in colors that suit a room big enough to hold a bed this size.
Bamboo Oversized Sheet Set
- Ready-made for Wyoming, Texas, Alberta, and Alaskan King
- 100% bamboo viscose, cooling and breathable
- Deep pockets for thick oversized mattresses
From $114.99
Shop the setThe duvet and protector are the same problem
A standard King duvet cover looks lost on an Alaskan King, and a normal mattress protector will not stay put. SGI cuts both to match. The 1000 thread count cotton duvet cover comes in Oversized King and Super Oversized King so the top layer covers the full bed instead of floating in the middle. New to duvets on a bed this large? Our duvet cover guide walks through sizing and how to put one on without a wrestling match.
Underneath, the oversized waterproof mattress protector is cut for the same Wyoming, Texas, Alberta, and Alaskan sizes, with a deep elastic skirt that grips a tall mattress. On a bed this expensive to replace, it is the cheapest insurance you can buy.
Caring for oversized sheets
Big sheets need a little more thought at laundry time. Wash in cold or warm water on a normal cycle, and if your machine is on the smaller side, wash the fitted and flat sheets separately so they can move freely and rinse clean. Skip the fabric softener, which coats the fibers and dulls both bamboo and cotton over time. Tumble dry low and pull them out while barely damp; oversized sheets wrinkle less and go back on the bed more easily when they are not baked bone-dry. Store each set inside one of its own pillowcases so you can grab the right size at a glance.
A few common questions
Will King sheets fit an Alaskan King bed?
No. A King sheet is 76" x 80" and an Alaskan King is 108" x 108", so a King fitted sheet cannot even reach the corners. You need Alaskan King sheets cut to the full size.
What is the difference between a Wyoming King and a Texas King?
A Wyoming King is a square 84" x 84", best for extra shared width. A Texas King is 80" x 98", built for length, so it suits very tall sleepers who run out of room on a normal bed.
Do I need custom sheets or will a named size work?
If your mattress is a recognized size like Wyoming, Texas, Alberta, or Alaskan King, the ready-made bamboo set fits straight away. For any unusual measurement, the custom-cut cotton set is sewn to your exact numbers.
How do I measure for oversized bedding?
Measure the mattress width, length, and depth with a tape measure, edge to edge. Match those numbers to the size chart above, or enter them directly on the custom cotton set if none of the named sizes line up.
SHEETS THAT ACTUALLY FIT
From crib to Alaskan, we make it all. Take 10% off your first order with code SGIFIRST10.
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