Two complete mattresses zipped edge to edge into one larger bed; the halves separate into single beds for carrying through narrow stairs and for guest-room reconfiguration.
Also known as: zip and link bedzip-and-lock bedsplit-tension mattresshalf and half mattressZ&L
A zip-and-link mattress is two separate mattresses zipped together along their shared edge to form one larger sleeping surface. Each half is a complete mattress with its own cover and support system, and it works on its own as a single bed when the zip is opened. The format is a UK convention sold in king, super king, and extra king sizes, all measured here in UK centimeter sizing.
The compact-home problem it solves is access, not floor area. Zipped, the bed occupies its full king or super king footprint, so a small bedroom gains nothing while the bed is set up. The win comes at delivery, moving, and replacement, because each half is a manageable single that can be carried up narrow stairwells, around tight turns, and through doorways that a one-piece large mattress could never pass. Cleaning gets easier for the same reason, since each half is a one-person lift rather than one heavy two-person job.
The UK size ladder
One UK manufacturer that publishes the format lists three UK sizes. A king zip and link measures 150 by 200 cm overall and arrives as two 75 by 200 cm halves. A super king measures 180 by 200 cm and splits into two 90 by 200 cm halves, each a full-length, standard-width UK single. An extra king measures 180 by 190 cm, with 90 by 190 cm halves. The king's 75 cm halves are narrower than the 90 cm standard UK single, so a king's halves are small-single-width units rather than two ordinary singles. Super king halves match the standard single's 90 cm width but run 200 cm long, 10 cm longer than the 90 by 190 cm standard, which matters when you buy sheets for the separated beds.
Zip and link vs two singles and the split king
Putting two loose singles on a king base is the costly mistake. Two standard UK singles are 90 cm wide each, so side by side they span 180 cm, 30 cm wider than a 150 cm king frame, and they leave a center gap that sheets cannot hide while sliding apart in use. Purpose-built king halves are 75 cm each and add up to exactly 150 cm, with recessed zips, matched heights, and matched borders that keep the joined surface level. An aftermarket foam bed bridge exists precisely because pushed-together mattresses were never designed to mate; a zip and link builds the connection in. The second confusion is the US split king. Both are two halves, but a split king divides lengthwise into twin XL halves riding dual adjustable bases, while a zip and link divides across the width into two usable singles for access and guest flexibility.
Living with the halves
Zipping the bed together or apart takes about a minute. Split, it becomes two ordinary-looking single beds, and each half is light enough for one person to turn, which the same maker describes as making monthly turning significantly easier. The halves do not have to match internally, either. Each carries its own spring tension, so a couple with different body weights can share one bed that feels medium on one side and firm on the other. Because each half must also work as an independent bed, construction choices are narrower than for a one-piece mattress.
A guest room that reconfigures
The flexibility shows best in a guest room, where the same pair of mattresses switches between two singles for separate friends and one larger bed for a couple. One documented UK scenario is a guest room above a shop reached by a narrow spiral staircase: the super king arrives as two 90 by 200 cm halves and is zipped together on the spot, because no full-size mattress could make the climb. For a home with a similar staircase or a tight doorway, the format turns a delivery problem into a non-problem. Where a bed this size is more than the room needs, a rollaway bed, a folding mattress, or a sofa bed covers occasional guests in less floor area.
Frequently asked questions
Will I feel the zip between the two halves?
In normal use, no. The zip is recessed into the mattress border just below the sleeping surface, so once the bed is made up the join is not felt. The honest limit is that a seam still exists where a one-piece mattress has none, so expect a bed whose join goes unnoticed, not a literally seam-free mattress.
Can the two halves have different firmness?
Yes. The option is called split tension, and retailers also sell it as a half and half mattress. The two halves must still match in height and border construction so the zipped surface sits level; only the internal spring tension should differ, so state both tensions when you order.
What base and bedding do zip and link halves need?
Confirm the base is a matching split before ordering, because each half must be supported when the beds are separated. One UK maker delivers king divan bases as two 75 by 200 cm halves and super king divans as two 90 by 200 cm halves, matching the mattress halves. Plan bedding for the half widths too, since each half is made up as a single when the bed is split.
Is a zip and link mattress a good guest-room choice?
Yes. One UK maker publishes a spec aimed at halves that must suit many different guests: a medium 1.4-gauge pocket spring, two-sided flippable construction, and a medium comfort layer. The build exists because a guest bed has to suit unknown sleepers rather than one known body.
Where did zip and link mattresses come from?
The format is a UK hospitality convention, commonly used in hotels, guest houses, and vacation rentals to switch rooms between twin and double or king configurations. Home adoption followed, and one UK maker credits zip and link construction with helping the king size overtake the double as the UK's most popular bed size by removing the narrow-stairwell barrier that kept large mattresses out of many houses.
Related terms
Bed Bridge
A narrow foam pad laid in the seam between two mattresses, usually twin XLs, to close the gap and turn the pair into one king-sized sleep surface.
Also known as: twin to king converter kit, twin XL to king converter, mattress connector, split king gap filler, bed gap filler, king mattress gap filler
Beds and compact bedroomsFolding Mattress
A hinged-panel foam mattress, usually tri-fold, that unfolds into a floor-level guest bed and folds into a closet stack, with no frame needed.
Also known as: tri-fold mattress, trifold mattress, foldable mattress, portable floor mattress, guest mattress
Beds and compact bedroomsMattress Topper
A removable 1 to 4 inch comfort layer placed on a mattress to soften or firm its feel; thicker than a pad and not a protection product.
Also known as: topper pad, bed topper, feather bed
Beds and compact bedroomsRollaway Bed
A folding steel-frame guest bed with an integrated thin mattress that rolls on casters, opens to a twin-class bed, and folds in half to store in a closet.
Also known as: roll-away bed, folding bed, guest bed, hotel rollaway
Beds and compact bedroomsSofa Bed
A couch that hides a folding metal frame and thin mattress under its cushions, converting daily seating into a guest bed; measure the open bed, not the closed sofa.
Also known as: sofabed, sleeper sofa, sleeper, hide-a-bed, hide-a-bed sofa, pullout sofa, pull-out sofa, bed-couch, canapé-lit, bäddsoffa, slaapbank
Beds and compact bedroomsTrundle Bed
A low bed on casters that stores under a taller host bed and rolls out for sleeping, hiding a second guest bed inside the host bed's footprint.
Also known as: truckle bed, trundle