One solution that will allow you to still individually move your sides would be to use a flex top or solid Sleep Number sheet set. It will keep you from falling in the gap, but still allow movement. I have some customers who also use a flextop or solid topper or mattress, pad and sheet, however the more layers on top tomorrow awkward individual movement might be. The good thing is that with these solutions, you are not forcing more into the split, and as needs change, or as you figure out how to cuddle or have activities side to side they can be removed. Answer from Deleted User on reddit.com
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Reddit
reddit.com › r/mattress › gap filler needed for split king (non-adjustable)?
r/Mattress on Reddit: Gap Filler Needed for Split King (non-adjustable)?
September 5, 2018 -

My wife and I purchased identical split twin XL mattresses because we could not fit a king up the attic stairs (we converted our attic to a master BR). We will not be using them on adjustable frames. We intend to use a 2 inch king latex topper AND a king quilted mattress pad to go under the king fitted sheet we will be using over both mattresses.

My question is: will we still need a gap filler to avoid falling the the space between two mattresses? Or will we be okay with the two pads and the fitted sheet holding everything together? Mattress arrives soon, so depending on the replies, I may order a gap filler to arrive at the same time.

Thanks in advance for your replies!!!!

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Reddit
reddit.com › r/mattress › adjustable mattress bed bridge
r/Mattress on Reddit: Adjustable Mattress Bed Bridge
September 21, 2025 -

Does anyone have a recommendation for a good Split King Gap Filler Bed Bridge for Beds with Adjustable Bases? Me and my partner each have a Twin XL mattress that makes a Split King and want a Gap Filler that is comfortable to lay on for bed activities, but will also stay in place when one of us is propped up on their mattress with their base and the other one is laying completely flat on their mattress with their base. We wanted one that would stay in this situation so we don’t have to keep tossing it off the bed and bringing it back on when we want it. Does one of these exist?

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The Well-Trained Mind Community
forums.welltrainedmind.com › lounge › the chat board
Anyone have a split king bed? I need to fill that gap! - The Chat Board - The Well-Trained Mind Community
December 29, 2024 - We recently purchased an split adjustable base bed with 2 twin XL mattresses. I now know why they didn't have one on the floor-that gap is much bigger than they pitched it. I know there are products to bridge the gap, but Is there one you would recommend? Thanks!!
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Amazon
amazon.com › split-king-gap-filler-adjustable-bed › s
Amazon.com: Split King Gap Filler For Adjustable Bed
split king adjustable bed · split king gap filler · split king sheets · split king sheet sets · split king adjustable bed frame · Previous · 1 · 2 · 3 · 4 · Next · Visit the help section or contact us · Go back to filtering menu · Skip to main search results ·
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GhostBed®
ghostbed.com › pages › problems-with-split-king-adjustable-beds
4 Problems with Split Kings (& How to Solve Them) | GhostBed®
You can also pick up a “bed wedge” or “gap filler.” This accessory is usually made from memory foam. You can place it between your mattresses to smooth things out.
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Amazon
amazon.com › Vekkia-Bridge-Twin-King-Converter › dp › B0C819BQ9Y
Amazon.com: Vekkia Split King Gap Filler for Adjustable Bed,Twin to King Bed Converter Kit,Bed Bridge Twin to King,Mattress Connector with Washable Cover,for Guests Stayovers,Family Room(75in×10in) : Home & Kitchen
Bigger Bed In An Instant - Simply use this twin bed connector to make a king by pushing the two mattresses together and placing the bed bridge on top between them. You'd better cover it with a mattress pad or fitted sheet for extra stability. Proprietary Gap Filling System-The piece of foam attached special material to the twin bed connector is very sturdy with inherent structural integrity.
Find elsewhere
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Reddit
reddit.com › r/mattress › having trouble eliminating a split king gap
r/Mattress on Reddit: Having trouble eliminating a split king gap
October 15, 2017 -

I've been renting a room for a year now and the bed is really killing me. It's two smaller mattresses in a split king frame. Unfortunately I could only sleep on one side of the bed otherwise I start going into the gap and it's really uncomfortable.

I bought this gap filler thing that helps slightly, but every once in a while I have to move it around because it goes out of place.

On top of that I also built a quilted mattress topper which helps much more, but I can still really only sleep on one side comfortably because I can still feel a gap or a bump in the middle of the bed.

So I was thinking maybe I should also get a 2inch memory foam topper to put underneath the quilted one? Does anyone think that'll help or have any other suggestions? I can't buy a new bed or frame sadly

Edit: solution was to move out of that flat. My back is so much happier for it.

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Lowest Cost Mattress
lowestcostmattress.com › collections › adjustable beds & accessories › [bed bridge twin to king] split king gap filler for adjustable bed - mattress connector replaces a mattress gap filler and better bedder band. twin to king bed converter kit to join two twin beds
[Bed Bridge Twin to King] Split King Gap Filler for Adjustable Bed - Mattress Connector Replaces a Mattress Gap Filler and Better Bedder Band. Twin to King Bed Converter Kit to Join Two Twin Beds
[Bed Bridge Twin to King] Split King Gap Filler for Adjustable Bed - Mattress Connector Replaces a Mattress Gap Filler and Better Bedder Band. Twin to King Bed Converter Kit to Join Two Twin Beds
Brand: Bedbinder DeluxeColor: WhiteFeatures: ♥💓 Looking For A Bed Bridge That Prevent You From The Gap In The Middle Of Your Twin Bed, Right? 💓♥ This Bed Bridge of Bedbinder DeLuxe is all you need when you want to get rid of the your Bed Gap or Sliding Mattresses. This Twin Bed Connector does not only replace the Bed Gap Filler or Twin Gap Filler, but this Mattress Connector also works as a Bed Space Filler and can be used with or without a Better Bedder or a Topper 👑🛌 Over 75.000 Happy Customers In The USA 🛌👑 Having these Bed Straps for Mattress of Bedbinders, you don't need your Gap Filler
Price   $67.00
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Reddit
reddit.com › r/mattress › split bed gap filler
r/Mattress on Reddit: split bed gap filler
July 30, 2020 -

We have a split King on the way and we're worried that the gap between the beds will be a trap for remotes and cell phones. Is there a bed sheet or other product on the market that would put some kind of elastic fabric between? Thinking something stretchy that could withstand one bed adjusted while the other is flat. I tried poking around Amazon but couldn't find anything like that.

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Amerisleep
amerisleep.com › blog › mattress guides › how to keep a split king mattress together
How to Keep a Split King Mattress Together - Amerisleep
November 13, 2025 - Platform beds with solid surfaces provide more stability than traditional box springs, which can allow more movement. Adjustable bed frames work well with split king mattresses if they include syncing features that keep both sides moving together.
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Amazon
amazon.com › ask › questions › Tx13H5K5F1NUWS1
Amazon.com: Customer Questions & Answers
FeelAtHome Twin to King Bed Converter kit (8" Class) - Bed Bridge - Split King Gap Filler for… · Q: Does it work for an adjustable bed? asked on March 3, 2019 · Showing 1-7 of 7 answers · It was fairly easy to connect and so far it’s working.
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Wayfair
wayfair.com › keyword.php
Split King Bed Gap Filler | Wayfair
Turn two Twin XL mattresses into a comfortable King with this bed bridge converter kit. Designed for adjustable beds, it creates a stable, seamless connection using a foam gap filler and securing straps.
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Mattress Underground
forum.mattressunderground.com › mattress talk › general mattresses questions
Twin XL "SPLIT KING" Gap issue. How to solve? - General Mattresses Questions - Mattress Underground
May 22, 2013 - Any recommendations on how to solve this center gap issue? We haven’t decided on a bed frame yet, so perhaps that’s a part of the issue. But we are using 2 raze adjustable beds with the wheels locked. But still the beds part in the middle after our 60 pound boxer lays in the “void” i have read on amazon about the “create a king” but it doesn’t have great reviews and seems cheap.
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Reddit
reddit.com › r/mattress › how to keep split king (twin xl) mattresses from moving apart on adjustable base?
r/Mattress on Reddit: How to keep split king (twin xl) mattresses from moving apart on adjustable base?
February 25, 2024 -

We have a split king with adjustable base. We also have dogs and a 9yo son, which means our twin xl mattresses get split apart constantly. Every day I have to rescue blankets from “the crack” and push the mattresses together. Does anyone have any good methods to keep the mattresses together? Has anyone tried attach some kind of a bracket to the sides of the base to prevent the mattresses from sliding off, kind of like the wire bracket at the foot of the base?

Edit: I bought these brackets.

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DCUM Forum
dcurbanmom.com › jforum › posts › list › 1242118.page
Split King Adjustable Bed - gap filler?
Subject: Split King Adjustable Bed - gap filler? quote · Anonymous · report · 11/26/2024 16:35 · Subject: Split King Adjustable Bed - gap filler? quote · Anonymous · report · 11/26/2024 16:46 · Subject: Split King Adjustable Bed - gap filler? quote · Anonymous ·
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Reddit
reddit.com › r/mattress › split king bed experience? good or bad?
r/Mattress on Reddit: split king bed experience? Good or bad?
April 1, 2021 -

Anyone here actually have a split king mattress? If so I am looking to hear about your experience with them? Was the space/gap in between the mattresses ever an issue or annoying? Do you wish you would have a full sized king?

We are worried that maybe it won’t be so enjoyable as it sounds, considering the gap in the middle. And also we feel like it might make it hard for our children and dog to sleep with us from time to time or lay down in the same bed as us and watch movies.

We are also interested in getting the split king bases as well. Right now we are looking into both the Tempurpedic and Sleep Number models.

Any feedback would be great. We don’t want to make any mistakes the first time around, considering the price tag!!!

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Bedbinders
bedbinders.com › home
Home - Bedbinders
May 2, 2024 - Follow these simple steps to set up your BedBinder and enjoy a smooth, gap-free sleep surface in minutes. Place the BedBinder horizontally across the mattresses where they meet. Ensure it’s centered and aligned for maximum effectiveness.