Bed linen covers the sheet, the duvet cover and the pillowcases, and three things decide how a set feels: what it’s made from, how it’s woven, and how finely the yarn is spun. Thread count gets most of the attention in shop listings, though it’s not always the most useful of the three on its own. Here’s what each one actually does.
Fabric Is The First Decision
Cotton accounts for most bed linen sold in the UK, and the quality difference comes down to staple length, which describes how long the individual fibres are. Longer staples spin into smoother, stronger yarn that pills less over time. Egyptian and Pima cotton are the names you’ll see for long-staple varieties.
Linen, made from flax, is the other traditional choice. It feels textured, it’s noticeably cooler in summer, and it softens with every wash while holding its strength for years.
Then there are the regenerated cellulose fabrics, sold under names like Tencel and bamboo viscose. They’re smooth, they move moisture away, and they suit warm sleepers. Polyester blends tend to be cheaper and resist creasing, but they can trap heat – and for anyone who sleeps warm, that’s often the deciding factor.
Weave Decides The Feel More Than The Fibre
Two sets made from identical cotton can feel entirely different depending on how the threads cross. Percale is a simple one-over, one-under weave. It’s matte, crisp and light, it breathes well, and it’s the closest thing to good hotel bedding. Sateen uses a weave where more thread sits on the surface, which produces a soft, slightly lustrous finish that feels warmer against the skin.
Neither is necessarily better; percale suits warm sleepers and anyone who likes a cool, crisp bed. Sateen suits people who want their bedding to feel soft on contact.
What Thread Count Actually Tells You
Thread count is the number of threads in a square inch of fabric. Up to a point, a higher count means a denser, smoother, longer-lasting fabric, and there’s a real difference between 200 and 400.
Above that, the picture depends on the yarn. Very fine, high-quality yarns genuinely allow counts of 800 or 1,000 to be woven into fabric that feels exceptional, and premium bedding at those counts is a legitimate luxury choice. What you need to watch for is multi-ply inflation, where a manufacturer twists several cheap, thin threads together and counts each strand separately to reach an impressive number. The fabric that results feels heavy and sleeps hot.
The practical approach is to look at fibre, staple length and weave first, then treat thread count as a supporting detail.
Getting The Sizes Right
UK bedding sizes match bed sizes, so a king duvet cover fits a king duvet. The complication is that many people prefer a duvet a size larger than the bed – this is sleep brand Simba’s own recommendation for couples or anyone who wants more overhang.
A standard king size bed takes a 150cm by 200cm mattress, and the duvet that matches measures 225cm by 220cm. A super king duvet is 260cm by 220cm, a double is 200cm by 200cm, and a single is 135cm by 200cm. If you size up your duvet, remember the cover has to match the duvet size.
Fitted sheets need a third measurement, which is depth. Deep hybrid mattresses can run past 30cm, and a sheet cut for a 25cm mattress won’t stay on one.
Don’t Forget The Layer Underneath
A mattress protector sits between the mattress and the fitted sheet, and it needs to match the bed size and the depth of everything it’s covering. Simba’s protectors are built to fit mattresses up to 40cm deep, which covers a deep mattress with a topper on it.
Buy the protector at the same time as the sheets, because adding one later often means the fitted sheet no longer fits.
Washing Keeps Or Ruins It
Most bed linen fails through laundry habits long before it wears out.
- Before doing anything, check the label first.
- Wash cotton at 40 degrees for normal use, and higher only when you need to.
- Skip fabric softener, which coats fibres and reduces absorbency.
- Don’t overload the machine, since fabric needs room to move to get clean.
- Line dry where you can, and use a low heat setting in a tumble dryer.
- Rotate between two sets so each one gets a rest.
Linen and cotton both improve for years under that routine. Blends don’t.
FAQs
Is a higher thread count always better?
No. It’s meaningful up to around 400 for standard cotton, and beyond that the quality of the yarn matters more than the number. Genuinely fine yarns can produce excellent fabric at 800-1000 or above, but a high number achieved by twisting cheap threads together produces a heavy sheet that sleep warmer.
What’s the difference between percale and sateen?
Percale is a plain weave with a crisp, matte, cool finish. Sateen has more thread on the surface, which gives a softer, slightly shiny feel that holds a little more warmth. The fibre can be identical in both.
Which bed linen is best for hot sleepers?
Percale cotton, linen, or a Tencel-type fabric. All three move moisture away from the skin and allow air through. Polyester blends and heavy sateen are the ones to avoid if overheating is your issue.
Should the duvet be the same size as the bed?
Not necessarily. UK duvets are sized to match beds, but sizing up gives more overhang and helps if you share with someone who pulls the covers. If you do size up, the cover needs to match the duvet.
How often should bed linen be washed?
Sheets and pillowcases every one to two weeks for most people, and more often in summer or if you sleep warm. Duvet covers can go slightly longer, though they collect more than people assume.
