Top Split King Bamboo Sheets — Cooling Viscose for Head-Split Beds
Top Split King bamboo sheets are sized for a King adjustable base that lifts only at the head — one King-size fitted sheet with a split cut about a third of the way down, so the head section rises freely while the foot stays one solid piece. Bamboo Is Better's Signature Sheet Set in Top Split King is viscose from bamboo, OEKO-TEX Standard 100 certified, tested to sleep up to 3× cooler than cotton, and priced at $369 with free shipping. It looks and feels like an ordinary King when the bed is flat. Backed by 251 reviews at 4.91★, a 30-night sleep trial, free shipping, and a 1-year warranty.
Shop Top Split King Bamboo Sheets — $369 →
Why a regular King sheet doesn't work on a Top Split King base
A Top Split King base is one King mattress that lifts only at the head — the split runs across the top third and the foot stays connected as a single piece. A standard King fitted sheet has no split, so the moment the head section rises it drags the whole sheet upward and pops the bottom corners loose. A Top Split King fitted sheet has that head split built into the fabric, so the raised section lifts cleanly while the rest of the sheet stays put — and lies flat like a normal King when the bed is down.
What's in a Top Split King bamboo sheet set
- One split-top fitted sheet — a full King fitted sheet split about a third down from the head so the head lifts freely while the foot stays one piece; 15″ deep pocket with corner straps that secure mattresses up to 18″ deep
- One king-size flat sheet — covers the whole bed for a traditional look when the base is flat
- Two pillowcases — standard/queen sized, same viscose-from-bamboo fabric
If you're not sure which split size your base takes, our specialty size guide compares the fit, dimensions, and independent-sides differences across all four split sizes.
Why bamboo on an adjustable base
- Up to 3× cooler than cotton — adjustable-base sleepers are disproportionately hot sleepers (elevating the head traps heat against the neck and shoulders); viscose from bamboo wicks moisture and breathes where cotton holds both in.
- OEKO-TEX Standard 100 certified — independently tested for 100+ harmful substances, certificate available on request. See our OEKO-TEX certification page.
- Top Split King is one of the rarest sheet sizes on the market — almost nobody makes it. Bamboo Is Better does, at full depth.
Top Split King vs. the other split sizes
| Size | Fits | Price |
|---|---|---|
| Split King | King adjustable base, two Twin XL halves — the most common configuration | $309 |
| Split Cal King | Cal King adjustable base, for taller sleepers (6′2″+) | $309 |
| Top Split King | King base where only the head articulates — one-piece foot | $369 |
| Split Queen | Queen adjustable base — smaller rooms | $289 |
Not sure which one your base takes? The full breakdown — dimensions, independent-sides comparison, and a picker — is on our specialty size guide. If you're pairing sheets with a new adjustable base, see adjustable bases.
What hot sleepers say
★★★★★ "Super soft and comfortable. Great customer service. I run hot, and these sheets are great at cooling. I would definitely and have bought again and again"
— Oscar, verified buyer
★★★★★ "These sheets are the softest I’ve ever slept on. The quality is amazing and they’re so beautiful! Silky smooth and get better with ever wash!"
— Kelby M., verified buyer (Seattle)
★ 4.91 · 251 reviews · OEKO-TEX Certified · 100,000+ customers · 30-night trial
Frequently asked questions
What size sheets do I need for a Top Split King (head-split) base?
Top Split King bamboo sheets: one King-size fitted sheet split about a third of the way down from the head, so the head lifts freely while the foot stays connected, under one king-size flat sheet, plus two standard pillowcases.
What's the difference between Split King and Top Split King?
Split King splits the entire mattress into two independent Twin XL pieces, so both sides raise separately and it needs two fitted sheets. Top Split King splits only the head third with a single one-piece foot, so one fitted sheet covers the whole bed — the right choice for bases where just the head articulates.
Will a regular King sheet set work on a Top Split King base?
Not well. A standard King fitted sheet has no split, so when the head section of the base lifts it drags the sheet and pops the bottom corners loose. A Top Split King fitted sheet has the split cut into the head so it lifts cleanly.
Are Top Split King bamboo sheets cooler than cotton?
Yes. The same viscose-from-bamboo fabric as the full-size Signature line, tested to sleep up to 3× cooler than cotton, moisture-wicking and OEKO-TEX Standard 100 certified.
How much do Top Split King bamboo sheets cost?
Bamboo Is Better's Top Split King Signature Sheet Set is $369, with free U.S. shipping, a 30-night sleep trial, and a 1-year warranty.
Do Top Split King sheets fit deep adjustable mattresses?
Yes. The fitted sheet has a 15″ pocket with corner straps that secure mattresses up to 18″ deep, which covers the thicker mattresses common on adjustable bases.
Lift at the head, stay cool all night — on a bed that still looks like a King.
Shop Top Split King Bamboo Sheets — $369 Compare all split sizes → Full adjustable-bed sheet guide →