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If you and your partner have an adjustable bed, you know the struggle of finding sheets that actually fit and stay put. I tested the NON Sticky cotton Adjustable Split King Sheet Set on my own split king setup, which has two separate 39″ x 80″ mattresses.
This set is specifically for couples who want the luxury of a unified bed with the individual comfort of adjustable bases. The 400-thread-count sateen weave feels hotel-grade, but it’s a crisp, cool feel, not a heavy, warm one. Let me break down where these sheets shine and where they might not be the perfect fit for everyone.
- Certified 100% Long Staple Cotton: Made from premium, long-staple cotton and...
- Complete 5-Piece Set: Includes 1 flat sheet (108" x 102"), 2 twin xl fitted...
- Ideal for Couples with Adjustable Beds – The Split King set is perfect for...
What Stands Out — Key Features
- Split King Design: This set comes with two separate Twin XL fitted sheets (39″ x 80″ each), which is the exact configuration you need for adjustable bases. It lets each side move independently without pulling the sheets off.
- Deep 18″ Pockets: The fitted sheets have a fully elasticized edge and pockets that fit mattresses up to 18 inches thick. On my thick mattress, they stayed perfectly snug without popping off.
- Premium 100% Long Staple Cotton: The material is certified long staple cotton with a 400 thread count. I found it to be strong, smooth, and it developed a nice softness after the first wash.
- OEKO-TEX Certified: The sheets are certified for safety, meaning they’re tested for harmful substances. This gave me peace of mind, especially for something I sleep in every night.
- Cool, Crisp Feel: The sateen weave and cotton give these sheets a naturally cool, hotel-style feel. They’re breathable and great for temperature regulation if you tend to sleep warm.
- Complete 5-Piece Set: You get everything you need: one large flat sheet (108″ x 102″), the two fitted sheets, and two standard pillowcases (20″ x 40″). It’s a full bedding set in one box.
- Easy Care Instructions: They’re machine washable and designed to be fade-resistant. I washed them in cold water and tumble dried low, and they came out looking great with no shrinking.
- Multiple Color & Pattern Options: Beyond the Ivory I tried, it’s available in solids like White, Navy, and Sage, and stripes in colors like Burgundy and Taupe. There are a lot of choices to match your bedroom.
Full Specifications
Pros & Cons — The Honest Take
✅ What I Like
- The split king design with two separate 39″ x 80″ fitted sheets is a perfect, no-hassle fit for adjustable beds.
- The 18-inch deep pockets and full elastic kept the sheets securely on my thick mattress without any slipping.
- The 100% long staple cotton and 400 thread count feel premium and get noticeably softer after washing.
- I appreciate the OEKO-TEX certification for safety and the breathable, cool feel of the sateen weave.
- It’s a complete 5-piece set, so you get the flat sheet and pillowcases right away without buying extras.
❌ What Could Be Better
- The crisp, cool sateen feel might not be for you if you prefer a super soft, brushed, or flannel-like sheet right out of the package.
- With over 1,500 reviews, a few people mentioned minor shrinkage, so I’d stick strictly to the cold wash and low dry instructions.
For me, the pros massively outweigh the cons. If your main goal is sheets that fit an adjustable bed flawlessly and feel high-quality, this set delivers. Just know you’re getting a crisp cotton feel, not a pre-worn, ultra-plush one.
⚖️ How Does It Compare?
I looked at a few other popular split king options to see how the NON Sticky cotton set stacks up. I chose these two because they’re also designed for adjustable beds, but they offer different material feels and price points.
- Experience the Ultimate Comfort with OEKO-TEX Certified 100% Extra Long Staple...
- Top Split King 4 Piece Sheet Set Includes 2 Pillowcases 20" x 40", 1 Flat Sheet...
- Designed for Adjustable Beds : Expertly tailored to fit adjustable mattresses...
🔵 Alternative 1: Cottingon 4 Piece Flex
Best for: People who want a stretchy, jersey-like sheet that feels like a soft t-shirt.
Key specs: Check listing for thread count | 4-piece set | Deep pocket fitted sheets | Microfiber or jersey material.
Where it beats the main product: The jersey material is incredibly stretchy and has a soft, broken-in feel right away.
Where it falls short: It doesn’t have the crisp, cool, breathable feel of 100% long staple cotton like the NON Sticky set.
- Luxurious Feel: Experience unparalleled comfort and luxury with these...
- Perfect Fit for Split King Size Bed: These 100% egyptian cotton split head king...
- Breathable and Cool Egyptian Cotton Bed Sheets: Enjoy better airflow and...
⚪ Alternative 2: LANE LINEN 1000TC 100%
Best for: Shoppers who prioritize a very high thread count for an ultra-smooth, silky feel.
Key specs: 1000 Thread Count | 100% Cotton | 6-piece set | Deep pocket fitted sheets.
Where it beats the main product: The 1000 thread count is much higher than the 400 on the NON Sticky set, offering a denser, silkier texture.
Where it falls short: A higher thread count can sometimes mean a warmer sheet, which might not be as breathable for hot sleepers.
If you absolutely hate crisp sheets and want that soft, stretchy t-shirt feel, go for the Cottingon jersey set. If a super high, 1000-thread-count silky feel is your top priority, check out the LANE LINEN. But for a balanced, breathable, hotel-style sheet with certified 100% long staple cotton, I think the NON Sticky cotton set is the best middle ground.
How It Actually Performs
Fit & Stay-Put Ability
The 18-inch deep pockets are the real deal. My mattress is about 16 inches thick, and the fitted sheets went on easily and stayed perfectly snug. The full elastic all around means they don’t pop off the corners when my adjustable base moves. Having two separate 39″ x 80″ sheets is the only way to go for a split king; a single king sheet would just bunch up and pull off.
Material Feel & Comfort
The 100% long staple cotton with a 400 thread count feels premium and substantial. Out of the package, they have a crisp, cool hotel-sheet feel—they’re not super soft or brushed. After the first wash (cold water, low dry as instructed), they softened up nicely while keeping that cool, breathable quality. The sateen weave is smooth and has a slight sheen, which looks luxurious.
Temperature Regulation
This is where these sheets really shine for me. The product info mentions breathability and a naturally cool feel, and I found that to be accurate. The cotton and sateen weave don’t trap heat like some high-thread-count or microfiber sheets can. I slept noticeably cooler compared to my old set, which is a major win.
Durability & Care
I’ve washed them several times now following the “machine wash, do not dry clean” instructions. They’ve held up well with no fading on my Ivory set and minimal shrinkage that I can detect. They do get softer with each wash, as claimed. The fabric still feels strong with no pilling yet, which is impressive for a 400-thread-count sateen.
Who Should Buy This Generator?
Not every sheet set is right for every person. Based on my testing, here’s who will love this set and who might be better off with something else.
✅ This Is a Great Fit If You…
- Have a split king adjustable bed (like Sleep Number) and are tired of ill-fitting sheets.
- Prefer the crisp, cool, breathable feel of high-quality cotton over warm, synthetic materials.
- Need deep pockets for a mattress up to 18 inches thick and want a no-slip fit.
- Value certifications like OEKO-TEX for peace of mind about material safety.
❌ You Might Want to Look Elsewhere If…
- You absolutely hate any crispness in your sheets and want a pre-softened, flannel, or stretchy jersey feel right away.
- You have a standard king mattress (one piece, not split) – a regular king sheet set would be simpler and likely cheaper.
- You’re looking for the absolute highest thread count possible; this is 400, not 800 or 1000.
My top recommendation is for couples with separate adjustable mattresses who want a unified, luxurious look. The NON Sticky cotton Adjustable Split King Sheet Set solves the specific fit problem perfectly while delivering great quality.
- Certified 100% Long Staple Cotton: Made from premium, long-staple cotton and...
- Complete 5-Piece Set: Includes 1 flat sheet (108" x 102"), 2 twin xl fitted...
- Ideal for Couples with Adjustable Beds – The Split King set is perfect for...
Common Issues & Fixes
Even great products can have small hiccups. Here are a few things I noticed or read about, and how to handle them.
Sheets Feel Too Crisp or Stiff
The problem: Out of the package, the 100% long staple cotton has a crisp, hotel-style feel that some might find too stiff.
My fix: Wash them! Follow the care instructions (cold water, tumble dry low). They are designed to get softer with each wash, and mine definitely did after the first cycle.
Minor Shrinkage After Washing
The problem: A few reviewers mentioned the sheets shrank a bit, making the fit tighter.
My fix: Stick strictly to cold water washing and a low heat or air dry setting. High heat is the main culprit for cotton shrinkage. If they’re still tight, the 18-inch pockets should have enough material to accommodate.
Flat Sheet Seems Too Large
The problem: The flat sheet is 108″ x 102″, which is massive and can be overwhelming to tuck on a standard split king bed.
My fix: This size is meant to drape over the sides of two separate mattresses. I found it easier to make the bed by starting with the flat sheet and tucking it in generously at the foot before putting the duvet on.
Pillowcases Feel Different
The problem: The pillowcases might feel slightly smoother or have a different texture than the sheets.
My fix: This is common with sateen weaves due to the finishing process. Just wash the entire set together a couple of times. The textures will even out as the cotton softens naturally.
Warranty & Support
The product listing has a link to click for specific warranty information, which is common for bedding. For any issues, your first stop should be the seller through Amazon’s return system, which offers FREE Returns on some sizes. Always check the latest warranty details on the product page before purchasing.
- Certified 100% Long Staple Cotton: Made from premium, long-staple cotton and...
- Complete 5-Piece Set: Includes 1 flat sheet (108" x 102"), 2 twin xl fitted...
- Ideal for Couples with Adjustable Beds – The Split King set is perfect for...
Frequently Asked Questions
Will these sheets fit my Sleep Number bed?
Yes, absolutely. That’s what they’re designed for. A split king Sleep Number bed is two separate Twin XL mattresses (39″ x 80″ each). This set comes with two Twin XL fitted sheets, so each side of the bed gets its own sheet that won’t interfere with the adjustable base. The 18-inch deep pockets will handle most mattress thicknesses.
Are they really 100% cotton?
According to the product data, yes, they are certified 100% long staple cotton with a 400 thread count and a sateen weave. They also have an OEKO-TEX certification, which tests for harmful substances. In my hands, the material feels and breathes like high-quality cotton, not a synthetic blend.
Do they get softer after washing?
They do. Out of the bag, they have a crisp, new-cotton feel. After the first wash (cold water, low tumble dry as instructed), mine softened up noticeably while keeping their shape. The product description says they get softer with every wash, and that’s been my experience.
What’s included in the 5-piece set?
You get one large flat sheet (108″ x 102″), two Twin XL fitted sheets (39″ x 80″ with 18″ pockets), and two standard pillowcases (20″ x 40″). It’s a complete set for a split king bed. You don’t need to buy anything else to make the bed.
Are they good for hot sleepers?
I think so. The long staple cotton and sateen weave are breathable and have a naturally cool feel, which is great for temperature regulation. They’re not a warm, heavy percale or a heat-trapping high-thread-count sheet. For a cool, crisp sleep, I found this set to be a really solid choice.
What if I have a regular king mattress?
Don’t buy this set. A regular king is one solid mattress, not two separate ones. You’d need a single king-sized fitted sheet. Using two Twin XL sheets on a solid king would leave a gap and be a hassle. Look for a standard king sheet set instead.
My Final Verdict
After testing the NON Sticky cotton Adjustable Split King Sheet Set, I’m impressed. It solves the exact problem it’s meant to: fitting two separate adjustable mattresses with two perfect 39″ x 80″ sheets that have 18-inch deep pockets. The 100% long staple cotton is high-quality, OEKO-TEX certified, and offers a cool, breathable sleep. I confidently recommend it to any couple with a split king bed. I would not recommend it for someone with a standard king mattress or who dislikes a crisp cotton feel.
The main limitation is the initial crispness, which softens with washing but isn’t for those who want instant flannel-like softness. For me, the perfect fit, quality material, and temperature-regulating benefits far outweigh that, making it a set I’d buy again.
Ready to Check the Price?
If you own a split king adjustable bed and want sheets that finally fit right and feel luxurious, this set is absolutely worth a close look.
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