A split king adjustable bed needs more than a standard fitted sheet: the fabric must fit the mattress, and the split at the head must match how far each side moves independently. The picks below cover a flex-top king sheet and two split-top options. Before you choose, compare your mattress dimensions, split depth, and mattress thickness with the product details—especially if you use a topper.
Quick Comparison
| Product | Material | Fit details | Best for |
|---|---|---|---|
| CGK Unlimited Flex Top King Fitted Sheet | Double-brushed microfiber | Deep pockets for mattresses up to 16 inches; split depth not listed | Shoppers who want a soft, easy-care flex-top sheet |
| Cottingon Split-Top King Fitted Sheet | Long-staple Egyptian cotton | 78 × 80 inches; 34-inch split; 16-inch pockets | Those who prefer cotton and need a stated split length |
| Horbaunal Split-Top King Fitted Sheet | Microfiber | 78 × 80 inches; pockets up to 16 inches; split depth not listed | Shoppers who want a microfiber option with a side pocket |
Our Picks: Best Fitted Sheets For Split King Adjustable Bed reviews
CGK Unlimited Flex Top King Fitted Sheet: Soft Microfiber With Deep Pockets
This is a single fitted sheet made for a flex-top king setup, rather than a full set of separate sheets for both sides of a split king. Its double-brushed microfiber is designed to feel soft, while the breathable, moisture-wicking fabric may suit people who tend to sleep warm.
The sheet has deep pockets and elastic all the way around, and the listing says it fits mattresses up to 16 inches thick. That can be useful if your bed has a topper or pad, but measure the full mattress depth before ordering. The product title also calls it a split-head sheet, but the supplied details do not state the split length. Check that measurement against your adjustable base before buying.
Wrinkle, fade, and shrink resistance are listed as care features, and the sheet is OEKO-TEX MADE IN GREEN certified. Compared with the cotton Cottingon option, this one emphasizes easy-care microfiber rather than a crisp cotton feel. It is a practical choice if softness and a deep fit matter most, provided its split design matches your bed.
Pros:
- Deep pockets fit mattresses up to 16 inches thick.
- 360-degree elastic is designed to help keep the sheet in place.
- Soft, breathable microfiber with moisture-wicking properties.
- OEKO-TEX MADE IN GREEN certified, according to the product details.
Cons:
- The split length is not stated in the supplied product details.
- It is a fitted sheet only, not a complete sheet set.
Verdict: Choose this sheet if you want a soft, easy-care flex-top option and have confirmed that its split configuration fits your mattress.
Cottingon Split-Top King Sheet: Cotton With a Stated 34-Inch Split
This fitted sheet is designed for a split-top or flex-top king mattress. It measures 78 inches wide by 80 inches long and has a 34-inch split at the head. That specific measurement makes it easier to compare with your mattress than options whose split length is not listed.
The fabric is described as premium long-staple Egyptian cotton, with a cool, crisp feel and breathable construction. The listing also describes the cotton as certified safe and chemical-free, but does not name a certification in the supplied details. Its 16-inch pockets and extra-wide elastic are designed to keep the sheet snug as the bed inclines or reclines.
Compared with the microfiber picks, this is the clearest choice for shoppers who prefer cotton and need a stated split depth. Cotton may take more care than wrinkle-resistant microfiber: the care instructions call for cold or lukewarm washing and low-heat drying. Confirm that the 34-inch split and 16-inch pocket depth match your mattress before ordering.
Pros:
- Lists its dimensions and 34-inch split depth.
- Long-staple cotton is described as breathable with a cool, crisp feel.
- 16-inch pockets and full-perimeter elastic are designed for a secure fit.
- Made for split-top and flex-top adjustable mattresses.
Cons:
- The listing is for one fitted sheet, not a complete set.
- Its care instructions call for avoiding bleach and high heat.
Verdict: Pick the Cottingon if you want cotton and its 34-inch split matches your bed; it is the most straightforward option here for checking split depth before purchase.
Horbaunal Split-Top King Sheet: Microfiber With a Handy Side Pocket
Horbaunal’s fitted sheet is made for flex-head and adjustable king mattresses. It measures 78 by 80 inches and has pockets for mattresses up to 16 inches deep. The listing does not give the split length, so check that detail with the seller or product page if your adjustable base requires a specific head split.
The microfiber fabric is described as soft, breathable, and moisture-wicking. A pocket on the side is intended for small items such as a phone, glasses, or remote. That can be convenient on an adjustable bed, where a nightstand may be harder to reach in some positions, though the pocket adds a feature that the other two options do not offer.
The sheet is machine washable, and the product details say it resists fading, stains, and wrinkles. Compared with the Cottingon, it trades cotton for microfiber and does not provide a stated split depth. Compared with the CGK Unlimited sheet, it lists its overall dimensions and includes a storage pocket, but both leave a key split measurement unclear.
Pros:
- 78-by-80-inch size with pockets up to 16 inches deep.
- Side pocket can hold small bedside items.
- Soft microfiber is described as breathable and moisture-wicking.
- Machine washable and designed to resist wrinkles and fading.
Cons:
- The split depth is not stated in the supplied details.
- Only the fitted sheet is included.
Verdict: Consider Horbaunal if you want microfiber and a built-in side pocket, but confirm the split depth before buying.
How to Choose Fitted Sheets for a Split King Adjustable Bed
Confirm the kind of split your bed uses
“Split king” can refer to different mattress setups. Some have two separate mattresses, while flex-top or split-top models connect across the lower portion and separate near the head. These fitted sheets are described as flex-top or split-top styles, so check your mattress design before choosing one. A sheet made for a head split may not fit two fully separate mattresses.
Match the split depth
Measure from the head of the mattress to the point where the split ends. Compare that number with the sheet’s stated split depth. The Cottingon lists a 34-inch split; the supplied details for the CGK Unlimited and Horbaunal sheets do not give a split length. If the measurement is missing, verify it before ordering rather than assuming all flex-top sheets are alike.
Measure mattress depth, including any topper
Measure from the mattress bottom to the top surface, including any topper or pad you plan to keep on the bed. All three options list pockets that accommodate mattresses up to 16 inches, though the CGK Unlimited details describe this as fitting mattresses up to that thickness. A pocket that is too shallow can pull loose, while excess fabric may make the fit less tidy.
Choose fabric for your comfort and care preferences
The Cottingon is the cotton option and is described as cool and crisp. The CGK Unlimited and Horbaunal sheets use microfiber, which their product details describe as soft and easy to care for. Consider whether you prefer cotton’s feel or microfiber’s wrinkle-resistance claims, and follow the washing directions for the specific sheet you choose.
Check what is included
Each product here is described as a fitted sheet only. If you need a complete bedding set, check whether flat sheets and pillowcases are sold separately. Also consider small practical details: Horbaunal has a side pocket, while CGK Unlimited highlights OEKO-TEX MADE IN GREEN certification.
Frequently Asked Questions
Can I use a regular king fitted sheet on a split king adjustable bed?
A standard king sheet may not work well if your mattress separates or has a flex-top split. Choose a sheet made for your specific split design and confirm its dimensions and split depth.
What is the difference between a split-top and a full split king?
A split-top or flex-top mattress separates at the head so each side can move independently there, while the lower portion stays joined. A full split king uses two separate mattresses. Check which setup you have before buying a fitted sheet.
How do I measure the split depth?
Measure from the head of the mattress down to where the split ends. Compare that measurement with the sheet’s listed split depth. If the product details do not provide one, ask the seller to confirm compatibility.
Will these sheets fit a mattress with a topper?
The listed pocket depth for all three options is up to 16 inches, but the actual fit depends on the combined thickness of your mattress and topper. Measure the full depth before ordering.
Which option lists its split depth?
The Cottingon sheet specifies a 34-inch split. The supplied details for the CGK Unlimited and Horbaunal sheets do not state a split depth, so confirm that measurement before purchase.
Are these complete sheet sets?
No. Each product is described as a fitted sheet only. Check the product listing if you also need a flat sheet or pillowcases.
Final Recommendation
The Cottingon is the easiest pick to evaluate if your mattress has a 34-inch split and you prefer cotton. For a microfiber sheet, choose CGK Unlimited if its split design matches your bed, or consider Horbaunal if the side pocket is useful to you. In every case, verify the split depth and full mattress thickness before ordering.