Super King Mattress Protectors

The super king is the bed everything happens on: two adults, visiting children, the dog pretending not to be there, Sunday papers and the occasional spilt coffee. At 180 x 200cm it's the largest standard UK size — and the most expensive mattress in the house to replace, which makes protecting it less optional than for any other bed. These protectors are cut to the full super king footprint with extra-deep skirts, in quilted and fully waterproof options.

Cut for the Full 180cm — No Stretching, No Compromise

Super king owners know the frustration: half the bedding world stops at king, and "fits king/super king" usually means fits neither well. These protectors are made for the true UK super king — 180 x 200cm (6ft wide) — with skirts deep enough for the taller mattresses this size tends to come in. The full-width cut matters more than it sounds: on a bed this wide, an undersized protector doesn't just pull at the corners, it leaves the outer edges of the sleeping area — exactly where two people actually lie — unprotected.

Measuring 150cm across instead? That's a king, and our king size mattress protectors are the correct fit — a super king protector on a king mattress bunches loose fabric under your sheet.

The Family HQ Deserves Waterproof Thinking

Be honest about what a super king is for: it's the bed the whole household migrates to. Toddlers at 3am, movie nights, poorly children, pets with selective hearing. That's the case for going waterproof at this size — a silent, breathable membrane under the quilted surface that turns would-be mattress disasters into a 40°C wash. If your super king lives a quieter life, the quilted version keeps it fresh against nightly moisture and dust with a touch of added softness. Either way, the protector is the only washable defence a mattress this size has — and at super king prices, often £600 to £1,500+, it's defending more than any other bed in the house. The full type-by-type rundown lives on our mattress protectors page.

Fitting a Bed This Size Without the Wrestling Match

Changing anything on a super king is a two-person job nobody volunteers for, so fit matters twice as much. The deep elasticated skirt goes on like a fitted sheet — corners first, diagonal to diagonal — and then stays anchored through the week; you shouldn't touch it again until wash day. Running a super king topper underneath? Fit the protector over the topper: one layer protects both, and there's one less thing to strip when accidents happen.

FAQ

What size is a super king mattress protector?
180 x 200cm, matching the standard UK super king mattress (6ft wide) — 30cm wider than a king. Ours are cut to the full footprint with extra-deep elasticated skirts.
Will a super king protector fit a king size bed?
It will physically go on, but badly — 30cm of spare width bunches into loose folds under your sheet. For a 150cm-wide mattress, a proper king size protector fits flat and secure.
Why is it harder to find super king protectors?
Super king is the least stocked standard size on the high street — many ranges stop at king. That's exactly why we cut ours specifically for the 180 x 200cm footprint rather than labelling a stretched king "king/super king."
Do super king protectors fit extra-deep mattresses?
Yes — super king mattresses run deep, and our skirts are cut with extra drop to wrap them fully, topper included. Fitted corner-to-corner, the protector stays anchored despite the size.
Is a waterproof protector worth it on a super king?
If children or pets ever join the bed, absolutely — a super king is typically the most expensive mattress in the house, and the one most likely to host the whole family. A silent waterproof membrane is cheap insurance against the most costly bedding accident you can have.