Standard UK king size is 150cm x 200cm, and our topper is cut to that exact spec. If your mattress is a UK king (not a US king, which is a different size), it'll sit flush without overhang. Worth double-checking your mattress label if you're not sure which "king" you have.

Less than you're used to if you're currently on memory foam. Latex absorbs movement at the point of contact instead of rippling it across the surface, so a shift on one side of a king bed mostly stays on that side.

No, this is where latex actually outperforms memory foam. The open-cell structure lets air and heat pass through rather than trapping it, which matters more on a shared king bed where combined body heat is roughly double a single sleeper's.

15 to 20 years with normal use, versus the 2 to 3 years typical of memory foam toppers before they start showing permanent body impressions. Rotate it every few months for even wear.

It's firmer in the sense that it pushes back instead of moulding around you, but most people who switch describe it as more supportive, not harder. If you specifically want the hugging, moulded sensation, latex won't replicate that, and that's worth knowing before you buy.

It has enough weight and grip on its own that it won't shift under normal use, but we'd still recommend fitted topper straps or a topper-and-mattress protector combo if you're prone to a restless night, since a king size surface has more room to move on.

GOLS-certified organic Dunlop or Talalay latex core, wrapped in a GOTS-certified organic cotton cover. No polyurethane, no synthetic latex blends.

Natural latex is naturally resistant to dust mites and mould, which helps for asthma and dust allergies specifically. If you have a diagnosed latex protein allergy, this isn't the right product for you regardless of certification, since the allergy is to the material itself.

Any firm, flat, well-supported king size mattress works. It's not designed to fix a sagging or worn-out mattress underneath, it sits on top and changes the feel, not the structural support.

The organic cotton cover is machine washable. The latex core itself shouldn't be submerged or machine washed, spot clean only and let it air dry fully before the cover goes back on.

30-night trial, fully refundable. Given a king size topper is a two-person decision, that trial window matters more here than on a single, since it takes time for both people to adjust and agree.

Hollowfibre toppers typically flatten out in 12 to 18 months and offer little to no pressure relief, they're really just a softness layer, not a support layer. Latex is doing structural work, which is why the price and lifespan are both higher.