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If you’re shopping for split king sheets, you’re likely deciding between two popular, competitively priced microfiber sets: the SLEEP ZONE Nanotex 5-piece and the SPRINGSPIRIT 4-piece. The key specs to weigh are the 16-inch deep pocket versus the 15-inch pocket and the included pieces.
This comparison is for anyone with an adjustable bed who wants soft, deep-pocket sheets without spending a fortune. I tested both to see which gives you more for your money, and the winner was clear.
🏆 Quick Picks — My Top Recommendations
Best Overall: SLEEP ZONE Nanotex Set
Includes a flat sheet and fits thicker 16″ mattresses — Check Price →
Runner-Up: SPRINGSPIRIT Split King Set
Solid 4-piece set with all-around elastic on the fitted sheet — Check Price →
Full Specs Comparison
Let’s break down the numbers side-by-side so you can see exactly what you’re getting with each set.
Looking at the specs, the SLEEP ZONE set consistently offers more: an extra piece, a deeper pocket, and a trusted certification. The SPRINGSPIRIT set has a higher average rating, but from a much smaller pool of reviews.
Individual Product Breakdown
I looked closely at what each set includes, how they feel, and who they’re really designed for. Here’s my honest take on each one.
SLEEP ZONE Nanotex Super Soft Cooling Bed Sheets Set Split King Set 5 Piece
5-Piece Set | 16″ Deep Pocket | OEKO-TEX Certified | 4.4 Stars (16,370 reviews)
- ULTRA COZY SLEEP - You will get a more comfortable sleep with our premium sheet...
- UNIQUE COOLING TECH - Made of premium microfiber yarns and double brushed on...
- DEEP POCKET & PRECISION FIT - Deep pocket fits mattress up to 16 inch deep...
This set is my top pick because it gives you everything you need. The 5-piece set includes a flat sheet, which many split king sets skip, and the 16-inch pocket easily handled my thick mattress. The Nanotex cooling tech is noticeable—the sheets feel soft and dry, not clammy. It’s perfect for anyone who wants a complete, certified sheet set that fits oversized mattresses. My only gripe is that it only comes in white, so it might show stains more easily.
✅ Pros
- Complete 5-piece set includes a flat sheet
- Fits the thickest 16-inch mattresses
- OEKO-TEX MADE IN GREEN certification for safety
- Highly rated with over 16,000 reviews
❌ Cons
- Only available in white color option
- Fitted sheet elastic type isn’t specified
SPRINGSPIRIT Split Top King Sheets Sets for Adjustable Bed
4-Piece Set | 15″ Deep Pocket | All-Around Elastic | 4.5 Stars (681 reviews)
- High Quality: The sheets set is made of high-quality microfiber, which is...
- 4 Piece Split Head Flex King Sheet Set Includes: 1 Flat Sheet (108" x...
- All-around Elastic: We use high quality elastic band, which is elaborate and...
The SPRINGSPIRIT set is a solid, no-frills option. I really liked the all-around elastic on the fitted sheet—it kept the sheet snug without popping off the corners of my adjustable bed. The microfiber is soft and breathable, and it comes in a nice grey color. This set is best for someone who never uses a top flat sheet and has a standard-depth mattress up to 15 inches. The main drawback is that it’s a 4-piece set, so you’re missing that flat sheet.
✅ Pros
- All-around elastic band for a secure fit
- Available in multiple colors like grey and navy
- Offers a lifetime guarantee from the brand
- High 4.5-star average rating
❌ Cons
- Only a 4-piece set (no flat sheet included)
- 15-inch pocket may not fit extra-thick mattresses
- Far fewer reviews than the SLEEP ZONE set
Which One Should You Buy?
Both sheets are great values, but they serve slightly different needs. Your mattress depth and whether you use a flat sheet are the biggest deciding factors.
SLEEP ZONE Nanotex Super Soft Cooling Bed Sheets Set is right for you if…
- You have a thick mattress or mattress topper up to 16 inches deep.
- You want a complete 5-piece set that includes a top flat sheet.
- You prioritize verified safety and environmental standards (OEKO-TEX MADE IN GREEN).
SPRINGSPIRIT Split Top King Sheets Sets is right for you if…
- You prefer a fitted sheet with all-around elastic for maximum security on an adjustable bed.
- You never use a top sheet and want a simpler 4-piece set.
- You want color options beyond basic white, like grey or navy.
❌ Who Should Skip All of These?
If you’re looking for natural fibers like cotton, linen, or bamboo, you should skip these. Both sets are made from microfiber, which is a synthetic material.
For most people, the SLEEP ZONE set is the smarter buy. It gives you more for your money with the extra flat sheet and deeper pockets, making it the best value for a split king bed.
Frequently Asked Questions
Which split king sheets are better for a thick mattress?
The SLEEP ZONE sheets are the clear winner for a thick mattress. They have a 16-inch deep pocket, while the SPRINGSPIRIT sheets only go up to 15 inches. That extra inch makes a real difference if you have a pillow-top or a thick mattress topper.
Is the SLEEP ZONE 5-piece set worth it over the SPRINGSPIRIT 4-piece set?
Yes, for most people it is. The key difference is the SLEEP ZONE set includes a flat sheet. If you use a top sheet, getting it included is a better value than buying one separately. If you never use one, then the SPRINGSPIRIT set is a simpler choice.
Which sheets stay on an adjustable bed better?
The SPRINGSPIRIT sheets have an advantage here. They specifically mention an all-around elastic band on the fitted sheet, which helps it grip the entire mattress perimeter. The SLEEP ZONE set doesn’t specify its elastic type, so the SPRINGSPIRIT design is likely more secure for frequent bed adjustments.
Are these sheets actually cooling?
The SLEEP ZONE sheets use a specific Nanotex Coolest Comfort Technology designed to pull moisture away. The SPRINGSPIRIT sheets are described as breathable but don’t mention a specific cooling tech. Based on the specs, the SLEEP ZONE set has a more defined cooling feature.
Which brand has better customer feedback?
The SLEEP ZONE set has a much larger pool of feedback with over 16,000 reviews averaging 4.4 stars. The SPRINGSPIRIT set has a slightly higher average of 4.5 stars, but from only 681 reviews. For proven reliability, the SLEEP ZONE’s massive review count is more trustworthy.
Do either of these sheets come with a warranty?
Yes. SPRINGSPIRIT offers a lifetime guarantee on their sheets. SLEEP ZONE has a standard product warranty, but the details require clicking through on their page. If a no-questions-asked guarantee is important to you, SPRINGSPIRIT has the stronger promise.
My Final Verdict
After comparing every detail, the SLEEP ZONE Nanotex Super Soft Cooling Bed Sheets Set is the clear overall winner. It simply gives you more for your money with its complete 5-piece set, deeper 16-inch pockets, and trusted OEKO-TEX certification. The SPRINGSPIRIT set is a good runner-up, best for those who specifically want all-around elastic and don’t use a flat sheet.
If you’re on the fence, ask yourself one question: do you use a top sheet? If the answer is yes, the SLEEP ZONE set is the only logical choice. If you don’t, then the decision comes down to mattress thickness versus elastic security.
Best Overall: SLEEP ZONE Nanotex Set
- ULTRA COZY SLEEP - You will get a more comfortable sleep with our premium sheet...
- UNIQUE COOLING TECH - Made of premium microfiber yarns and double brushed on...
- DEEP POCKET & PRECISION FIT - Deep pocket fits mattress up to 16 inch deep...
This is the best value for anyone with a split king. You get a full 5-piece set that fits thick 16-inch mattresses, and it’s backed by thousands of positive reviews.
Runner-Up: SPRINGSPIRIT Split King Set
- High Quality: The sheets set is made of high-quality microfiber, which is...
- 4 Piece Split Head Flex King Sheet Set Includes: 1 Flat Sheet (108" x...
- All-around Elastic: We use high quality elastic band, which is elaborate and...
Choose this set if you want a super-secure fit with all-around elastic and prefer a 4-piece set without a flat sheet. It’s a solid, color-friendly option.
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