A mattress connector for your bed:
which one fits, and what separates them
You already know you want two mattresses joined. This is what separates a connector that holds from one that gives way, and which size belongs on your bed.
What is a mattress connector?
A wide band that runs under two mattresses and pulls them against each other, so the two behave as one sleeping surface.
Two separate twin beds are a slightly harder case, because the frames move as well as the mattresses. That one has its own page: twin bed connectors.
- It joins the mattresses. It does not fill the space between them, which is why the gap cannot open again.
- It sits under the mattresses, so nothing shows and nothing sits between you.
- Connector, joiner, combiner and bed binder all mean this same product. Only wedge means something different.
The Bedbinder Deluxe is one: an 80 cm band with three buckles, $57.00, fitted in 60 seconds.
What fitting one actually looks like
Across the middle, straps underneath, buckles snug. About 60 seconds, no tools.
$57.00 · 4.1/5 from 3,765 reviews · more than 250,000 sold
Four things separate one connector from another
They all look similar in a listing photo. These are the differences you notice after a month.
1. How wide the band is
A wide band spreads the pull across a broad section of mattress. A narrow strap concentrates it into one line, which is what makes cheap connectors dig in and leave a ridge you can feel through the sheet. The Bedbinder is 80 cm across.
2. Where the buckles sit
Some connectors close at the side of the bed. That is the design that fails on an adjustable base: the moment one side lifts, the buckle catches and the whole thing pulls off. Buckles that sit underneath stay out of the way. One customer had bought the side-closing type first and came back for this reason.
3. How strong the buckles are
Broken buckles are the most common complaint in this entire product category, and that includes older versions of ours. It is worth checking the rating rather than the word unbreakable. The whole Bedbinder, with its current nylon buckles, holds 550 kg and carry a 7-year guarantee.
4. How many straps
One strap holds a point. Three spread the tension along the seam, so the mattresses stay level with each other instead of pinching in one spot. This site sells the 80 cm with three straps.
Which bed does a mattress connector fit?
The band is 260 cm long and the straps are 200 cm each, which covers bed widths from 140 up to 200 cm. What decides the fit is the frame, not the mattress size.
| Your bed | Does it fit? | Worth knowing |
|---|---|---|
| Two twins pushed together | Yes | The case this product was built for. |
| Split king (two Twin XL) | Yes | Same thing by another name, and the most common US setup. |
| Boxspring, 140 to 200 cm | Yes | Straps reach comfortably at every width in that range. |
| Adjustable, head end only | Yes | Both heads still raise and lower on their own. |
| Adjustable, head and foot | No | Not recommended. |
| One single mattress | No | Nothing to connect it to. That is a grip problem, not a joining one. |
Scroll sideways on mobile for the full table.
Mattresses of slightly different heights are fine. A large height difference is not, because the band then pulls the lower mattress upward instead of sideways. If you are unsure, the sizing guide goes through it bed by bed.
Connector, joiner, combiner: is there a difference?
People search for this product under half a dozen names, and shops are happy to let the confusion stand.
The same thing, different words
- Mattress connector, bed connector, mattress connector strap. The most common names, and the most literal.
- Mattress joiner, bed joiner, mattress joiner strip. Mostly British phrasing for the same band.
- Mattress combiner, bed combiner, bed binder. What customers call it once they own one.
- Horizontal bed bridge. The category name, and the one that says what it does.
The word that means something else
- Wedge, gap filler, foam bridge. These sit in the gap. They do not join anything, so the mattresses keep drifting underneath them. If a listing calls itself a connector and shows a foam triangle, it is a wedge.
We go through that difference properly in the bed bridge comparison. On this page the short version is enough: joining and filling are not the same job.
What owners say about the build, not the idea
Three American customers on the parts of a connector you only judge after using one.
Works as designed.
“The material is strong so not as soft as it could be. The straps are good quality as are the buckles that go under the mattress instead of off to the side like some.”
Bed gap eliminator.
“This is awesome! It keeps our dual adjustable twin XL bed mattresses together. It was packaged very nicely. The instructions were clear. We would buy this again.”
Closed the gap.
“Tried other options but always left a divet. This one worked. Put it on mattresses, pulled it tight, added my king mattress pad and fitted sheet and you'd never know it was a split king.”
Questions people ask before buying a connector
Including the beds where the answer is no.
What is a mattress connector?
A wide band across both mattresses with straps underneath that hold them together, so they act as one bed. It joins them instead of filling the gap. Bedbinder Deluxe is one.
What is the difference between a mattress connector and a mattress joiner?
Nothing. Connector, joiner, bed binder and horizontal bed bridge all mean the same product. A wedge is different: it fills the gap instead of joining the mattresses.
What kind of strap can I use to keep two mattresses together?
A wide connector made for the job, like Bedbinder Deluxe: three straps run under both mattresses and buckle tight. Thin cargo or moving straps cut into the edges and slip.
Do mattress bridges work?
It depends on the kind. A foam bridge fills the gap and fails once the mattresses drift. A strap bridge like Bedbinder Deluxe holds them together, so the gap can't open again.
How can I join two single mattresses together?
Push them flush on frames of the same height, run a connector like Bedbinder Deluxe under both and tighten it. Then cover them with one fitted sheet for the combined bed.
How wide should a mattress connector be?
Wide enough to spread the pull over a broad part of the mattress, not one narrow line. Bedbinder Deluxe has an 80 cm (31.5 in) band with three straps underneath.
Do the buckles sit under the mattress or at the side?
Under the mattress. Buckles at the side can catch when an adjustable base lifts; underneath, they stay out of the way and you don't feel them.
Does a mattress connector work on a split king or twin XL?
Yes. A split king is two Twin XL mattresses, 76 inches together, within the 55 to 79 inches (140 to 200 cm) the Bedbinder fits.
Does it work on an adjustable bed?
Yes, if only the head end adjusts, and each head still moves on its own. If head and foot both adjust, Bedbinder Deluxe is not recommended.
Will I feel the connector under the sheets?
Hardly. Bedbinder Deluxe is only 0.1 cm thin and lies under one King fitted sheet over both mattresses. With a mattress pad or topper on top, you don't feel it at all.
How strong does a mattress connector need to be?
Strong enough that you don't think about it. The whole Bedbinder Deluxe holds 550 kg, and the buckles carry a 7-year warranty: if one breaks, you get a whole new Bedbinder.
How much does a mattress connector cost?
Bedbinder Deluxe costs $57. That's more than a foam wedge and far less than replacing two mattresses with one King.
Can I use a ratchet strap, bungee cords or zip ties instead?
No, they're not a real replacement. A ratchet strap or bungee wraps around the outside, squeezes the edges and slips. The Bedbinder runs across the middle and holds the mattresses together where you lie.
Does it work in a family bed?
Yes, many parents use it in a family bed to keep the mattresses together.
What is the best mattress connector for a box spring?
Bedbinder Deluxe, a strap connector that runs under both mattresses. It holds them together on box springs, platforms and slats alike.
What is the most durable mattress connector you can buy?
Look at the buckles and the warranty. Bedbinder Deluxe has rounded nylon buckles, holds 550 kg and carries a 7-year buckle warranty: if one breaks, you get a whole new one.
How do I keep two mattresses together without damaging them?
Use a strap with rounded nylon buckles, like Bedbinder Deluxe, on light tension. Sharp metal buckles and pulling too tight are what damage mattresses.
Where to go from here
Three pages that answer the question after this one.
Wedge or connector?
The two types side by side, if you have not settled that question yet.
Read moreWhich size for your bed
Bed by bed, with the measurements and the cases where it does not fit.
Read moreFitting one in 60 seconds
The whole install on video, and the same three steps in photos.
Read more
Two mattresses, or one bed?
An 80 cm band, three buckles, 550 kg, seven years. Fitted in 60 seconds.
90 nights to try it when you order on bedbinderdeluxe.com. On Amazon, their 30-day return window applies.