What are zip & link mattresses?

Different firmness on each side

The main advantage is being able to choose different firmness levels for each half of the bed. If one partner needs a firm mattress for back support and the other prefers something softer, a zip and link lets you have both. Each side works independently, so you're not compromising on comfort. Split tension mattresses offer a similar benefit without the ability to separate.

This is particularly helpful if there's a noticeable weight difference between partners, or if one of you has back pain that requires specific support. For advice on choosing the right firmness for back pain, read our back pain sleep guide.

Reduced motion transfer

Because zip and link mattresses are two separate units, movement doesn't transfer as easily from one side to the other. If your partner gets up during the night or shifts position frequently, you're less likely to feel it. The central zip creates a natural barrier that absorbs movement rather than passing it across the bed.

This setup also prevents roll together, which is when two people naturally gravitate toward the centre of the mattress due to the springs compressing. With zip and link, each mattress maintains its own shape independently.

According to our 2026 Sleep Survey, a quarter of UK bed-sharers say they sleep better when their partner isn't there. 13% have tried or would try sleeping on separate mattresses. Zip and link lets you do exactly that, without losing the big bed.

If partner disturbance is a regular issue, you might find our article on sleep divorce interesting. It covers when sleeping separately makes sense and how to approach the conversation.

Easier to deliver and move

Getting a king size mattress or super king mattress up narrow staircases or through tight doorways can be impossible. Zip and link mattresses arrive as two single mattresses, which are much easier to manoeuvre through awkward spaces. This is particularly useful in older properties with tight hallways or L-shaped stairs.

The smaller size also makes them lighter and easier to handle when you need to rotate or turn the mattress. Each half weighs significantly less than a full king or super king, so mattress maintenance becomes more manageable.

Before your mattress arrives, use our home measuring guide to check your delivery route. It covers how to measure doorways, staircases and corridors to avoid any issues on delivery day.

Flexible sleeping arrangements

Zip and link mattresses work well in guest rooms because you can configure them as one large bed for couples or separate them into two singles for individual guests. This flexibility means you're prepared for whoever stays over without needing multiple mattresses.

Some couples also use this feature for temporary situations. If one partner is ill, recovering from surgery, or needs different sleeping conditions (like different temperatures), you can unzip the mattresses and use separate bedding. For more on this, read our guide to sleeping comfortably together when you like different temperatures.

The Scandi sleep method is another option where couples share a bed but use separate duvets, which can work well with zip and link mattresses.

Can you feel the zipper in the middle?

You shouldn't feel the zip when lying on the mattress. The zipper sits underneath the seam along the top and bottom edges, tucked away from the sleeping surface. Modern zip and link mattresses are designed so the join is barely noticeable.

Some people are more sensitive to the seam than others. If you think it might bother you, a mattress topper will bridge the gap completely and create one smooth sleeping surface. The topper sits across both mattresses, masking the join entirely.