What's in this collection
The super king mattresses here include pocket spring, memory foam and hybrid constructions.
Pocket spring uses individually wrapped coils that move independently, absorbing movement across the surface and allowing air to circulate through the mattress. This makes it the most practical choice for a shared bed: when one person turns over during the night, pocket spring absorbs that movement rather than transferring it across the full 180cm. The open structure also keeps the sleeping temperature consistent, which matters more on a larger mattress where heat can build up between two people overnight.
Memory foam and hybrid options are also included. Hybrids combine a pocket spring base with a memory foam comfort layer, giving pressure relief at the surface, particularly useful for side sleepers, while retaining the breathability and motion isolation of a spring structure. For couples where one person is a committed side sleeper and the other prefers a more responsive surface, a hybrid often serves both better than either full foam or pure spring.
Super king dimensions and room planning
A UK super king mattress is 180cm wide and 200cm long. That 200cm length is shared across all sizes from king upwards, so the difference between a king and super king is purely width: 30cm more, split between two people as 15cm each.
Once the bed frame is added, allow around 190 to 195cm of floor width as a planning guide for the assembled bed. For the room itself, a super king sits comfortably in a bedroom of around 3.5m x 4m or larger with decent clearance on both sides and at the foot. It can be fitted into a smaller room, but once you're under about 60cm on each side the room starts to feel dominated by the bed in a way that affects how the space works day to day. The most reliable check is to tape the 180cm footprint on the floor, step back, and see how much room is actually left around it.
If you're buying a mattress alongside a new frame, the super king bed frames collection shows the full options with their assembled dimensions.
Super king or king
The king is 150cm wide; the super king is 180cm. Thirty centimetres sounds modest until you work out what it means per person: each of you gains 15cm of space, which is the difference between a bed you're sharing and a bed where you each have proper room.
The honest case for choosing a king over a super king has nothing to do with the sleeping experience, where the super king wins straightforwardly. It's about the room. Many UK bedrooms are sized comfortably for a king, with clearance on both sides and at the foot that makes the room feel liveable. The same bedroom with a super king often tightens those clearances to the point where one side is against the wall or you're stepping around the foot of the bed to get to the wardrobe. If that describes your situation, the king size mattresses page is the more practical starting point.
If the room genuinely has the space, the super king is worth having. The quality of sleep for two people who each have 90cm is consistently better than for two people sharing 75cm, and once you've slept on a super king long enough for it to feel normal, going back tends not to feel like an option.
Spreading the Cost
Finance is available on many of our super king mattresses, subject to status. A super king mattress at a good specification is a meaningful purchase, and it's the kind of thing where choosing on quality rather than minimum price tends to pay off across the years of nightly use it'll get. Spreading the cost makes it easier to make that choice properly. Details are shown on each product page.
Why buy from Shawcross
We're a Manchester-based retailer with a showroom and we deliver nationally across the UK. If you're deciding between a super king and a king and want a second opinion on how the room will work, or if you have questions about which construction type suits two people with different preferences, we're happy to talk it through before you order. Give us a call or come into the showroom.
