Thread Count: The Number That Stopped Meaning Anything review

Thread count began as a reasonable idea: count the threads in a square inch of fabric, and denser weaving generally meant finer yarn and a better sheet. Then it became a number printed on packaging, competing against other numbers on other packaging, and the industry did what industries do when a single figure starts selling product — it found ways to make the figure larger without making the sheet better.

The main trick is worth knowing because it explains the impossible numbers. A thread can be spun from several finer strands twisted together, and some manufacturers count each of those strands rather than the finished thread. A fabric with a genuine count of a few hundred can be advertised at four figures on this basis. Nothing about the sheet improved; the counting method changed. Once you know that, a very high number stops being impressive and starts being a question about arithmetic.

What actually determines how a sheet feels is the fibre and the weave. Long-staple cotton produces smoother, stronger yarn that pills less and lasts longer, which is why the good stuff is described by staple length rather than by count. Linen is cooler and rougher and softens over years. Bamboo-derived and microfibre sheets are smooth and cheap and generally less durable. And on the weave: percale is the flat, crisp, cool one that feels like a good hotel; sateen is the smooth, slightly lustrous, warmer one. Hot sleepers who buy sateen because it felt lovely in the shop are the most reliably disappointed customers in bedding.

The label word to be most careful with is Egyptian. It is used to mean long-staple cotton grown in Egypt, and it is also used, widely and legally in many markets, to mean very little at all — cotton grown anywhere, of any staple length, with a geographic word attached. A specific claim about staple length is worth more than a country name, and a certification you can look up is worth more than either.

There is also a trap in how sheets feel in the shop, which is the one sense buyers trust most. New sheets are often finished with softeners that wash out within a few cycles, so the silky packet can become an ordinary sheet by the second wash while the honest, slightly crisp one stays exactly as it was. This is precisely why percale is under-bought: it feels less impressive in the hand and better in the bed, six months later.

So shop like this. Decide whether you sleep hot or cold, and pick the weave accordingly rather than by touch. Look for a stated fibre and, if possible, a staple length. Treat anything between roughly two and four hundred as the sensible range in good cotton, and treat numbers far above it as a claim about counting rather than quality. Then wash them properly — warm rather than hot, dried low — because the difference between sheets that last five years and sheets that last one is far more often the dryer than the price.