You finally bought the Alaskan King, Wyoming King, or Texas King bed you've always wanted - and now you're staring down the bedding aisle wondering why nothing fits. Standard sheets won't work. Even "oversized king" packs from big-box stores fall short. Here's the full picture on oversized king sheets and exactly where to get them.
Why Standard King Sheets Won't Fit Oversized Beds
A standard King bed is 76" x 80". An Alaskan King bed is 108" x 108" - that's 32 extra inches in both directions. A standard fitted sheet barely covers a third of what it needs to. The elastic pulls loose on the first night, corners pop off, and you wake up sleeping on bare mattress. The same problem hits anyone on a Wyoming King or Texas King - the dimensions are just different enough that no off-the-shelf sheet works.
The only real fix is sheets cut specifically for your bed size - with a fitted sheet that accounts for the exact length, width, and depth of your mattress. SGI makes custom size sheets in 600 Thread Count Egyptian Cotton to fit any of these beds precisely.
Oversized King Size Chart: Alaskan, Wyoming, Texas and More
Here are the actual mattress dimensions for every major oversized king bed type, plus how they compare to a standard King:
| Bed Name | Dimensions (W x L) | Extra vs. Standard King |
|---|---|---|
| Standard King | 76" x 80" | Baseline |
| Wyoming King | 84" x 84" | +8" x +4" |
| Alaskan King | 108" x 108" | +32" x +28" |
| Texas King | 80" x 98" | +4" x +18" |
| Family King / Alberta King | 108" x 80" | +32" wide |
Notice that the Alaskan King is nearly square and massively wider than anything else on this list. That square footprint is why people who buy them often sleep with a full family - parents, kids, sometimes a dog - without anyone falling off the edge. But it's also why finding sheets becomes a specialty search.
What to Look for in Alaskan King and Wyoming King Sheets
Not all specialty sheet makers are equal. Here's what actually matters when you're buying Alaskan King sheets or Wyoming King sheets:
- ✓Confirmed dimensions on the fitted sheet. Any brand that sells "oversized king" as a single SKU without specifying the exact sheet dimensions is worth skipping. Your 108x108" bed needs a fitted sheet cut to 108x108" - not a generic "oversized" label that might be 96x96".
- ✓Deep pocket depth. Most oversized king mattresses run 14-18" deep, and some pillow-top versions go to 20". Fitted sheets should have at least a 16" pocket, ideally with elastic all the way around the perimeter - not just at the corners.
- ✓Thread count matched to use. For a family bed that gets washed weekly, 600TC Egyptian cotton is the sweet spot - soft enough to sleep on, durable enough to hold up for years. Higher thread count is not always better; fabric weave and fiber quality matter more.
- ✓A flat sheet that actually covers. On a 108"-wide bed, a standard flat sheet hangs about 18" off each side - not enough tuck to stay put overnight. You need a flat sheet cut wide enough to drape and tuck properly.
SGI's Oversized King Sheet Options
SGI Bedding has been making specialty and custom oversized bed sheets since the beginning. The catalog covers Alaskan, Wyoming, Texas King, Alberta King, Family King, and more - here's how the main options compare:
| Product | Thread Count | Material | Starting Price |
|---|---|---|---|
| 600TC Cotton 4pc Set | 600TC | Egyptian Cotton | $48.99 |
| Custom Size 600TC Set | 600TC | Egyptian Cotton | $124.99 |
| Bamboo Viscose Set | N/A (viscose) | 100% Bamboo | $72.99 |
| 1000TC Cotton Set | 1000TC | Egyptian Cotton | $54.99 |
If your bed is one of the standard oversized dimensions (Wyoming, Texas King, Alaskan), pick the 600TC set and choose your size from the dropdown. If your bed is a non-standard dimension - a bespoke frame, a side-by-side mattress setup, or an unusual depth - the Custom Size 600TC Sheet Set is built to your exact measurements.
Custom Size 600TC Cotton Sheet Set
- Cut to your exact bed dimensions
- 600 Thread Count Egyptian Cotton
- 9 colors including White, Navy, Taupe
- Deep pocket fitted sheet included
From $124.99
Shop custom sheetsDon't Forget the Mattress Protector
A bed this size is a major investment. The Oversized Mattress Protector from SGI is made specifically for Wyoming King, Texas King, Alaskan King, Family King, and Alberta King beds - waterproof, breathable, and with a deep-pocket elastic fit that stays put even on a heavily used family bed. At $44.99 it's cheap insurance on a mattress that likely cost thousands. Go to our oversized bed sheets collection to see everything available in your size.
Care Tips for Oversized King Sheets
Large sheets need a bit more care to wash well and last:
- ✓Use a large-capacity washer. Most home washers handle up to a King set. An Alaskan King sheet set may need a commercial machine or laundromat front-loader - forcing oversized sheets into a small drum wrinkles the fabric and wears it faster.
- ✓Cold water, gentle cycle. Egyptian cotton loosens up and softens with washing. Cold water preserves the fiber and keeps colors from fading.
- ✓Low heat or line dry. High heat is the main reason cotton sheets pill and lose their sheen. Tumble dry on low and pull out slightly damp - they'll finish drying on the bed with fewer wrinkles.
- ✓Skip the fabric softener. Softener coats cotton fibers over time and reduces breathability. With quality Egyptian cotton, the sheets soften on their own after a few washes.
A few common questions
What size is an Alaskan King bed?
An Alaskan King mattress measures 108 inches wide by 108 inches long - it's a nearly perfect square and the largest common bed size available. It's designed for families who want everyone sleeping in one space.
Are Wyoming King and Alaskan King sheets the same?
No. A Wyoming King is 84" x 84" and an Alaskan King is 108" x 108". They need different sheet sets. Using the wrong size will leave you with a fitted sheet that's too loose or a flat sheet that doesn't drape properly.
Can I buy Alaskan King sheets at a regular store?
Almost never. Big-box retailers and department stores stop at California King or occasionally "oversized king" - but these labels usually mean a sheet that's only slightly larger than standard, not one that fits a 108" x 108" Alaskan King. SGI Bedding specializes in these sizes - see the full oversized collection here.
What thread count is best for an oversized king bed used by a family?
For a high-use family bed, 600TC Egyptian cotton is the best balance of softness and durability. The best thread count guide on our blog breaks this down in more detail - but for most families, 600TC hits the sweet spot. You also want Egyptian cotton specifically, not blended cotton labeled as Egyptian - our Egyptian cotton guide explains how to tell the difference.
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