A cushion is one of the few things in a room you touch every day. You lean on it, prop a book against it, tuck a throw over your knees in February and push it aside in June. Fabric matters at least as much as colour — particularly here, where a damp fortnight in November and a mild afternoon in April can both fall inside the same heating season.

Wool, cotton and linen behave very differently across that year. Here is how each one holds up on the sofa, in the wash and through a winter of grey skies.

Wool: unbeatable warmth, with conditions

Wool is the fabric for a cold room, a draughty sash window and a radiator that never quite wins. The crimp in the fibre traps air, so a wool throw insulates while still letting moisture move away from you. That is why it feels warm without feeling clammy, and why it keeps working when the air is damp. Cotton soaks up that moisture and then sits against your skin, cold and heavy. In a British winter, the difference is obvious within ten minutes.

Weight is the number worth looking at. Lambswool throws in the region of 400–600 gsm suit a spring evening on the sofa; chunky room throws at 700 gsm and upwards are for January and a cold spare room. Merino is finer and softer next to the skin. British wool and recycled wool blends are tougher and slightly more rustic, and often cost less.

Wool also has the longest memory of the three. A well-made wool throw bought for a first flat will often still be in use when the sofa has been replaced twice. That durability is the argument for spending more here and less on the covers you will replace in three years. And if dust or allergies are a concern, wool's scaly structure makes it a poorer home for mites than a dense, damp pile — a genuine advantage in a bedroom.

Living with wool

• Pilling is normal on soft-spun yarns and usually settles after a few washes. A fabric comb deals with the rest. Tightly woven wool pills far less than a loose knit.
• Moths eat protein fibres. Wash or dry-clean wool before it goes into summer storage, then keep it clean in a lidded box with cedar or lavender — not in a sealed plastic bag, which traps damp.
• Washing means 30°C on a wool cycle, an enzyme-free detergent, no fabric softener and no wringing. Press the water out in a towel, reshape while damp and dry flat, away from radiators.
• Cushions in wool work well behind your back and less well under your head: they collect hair and lint, and a coarse knit snags on zips, buttons and claws.
• Felting is permanent. One hot wash turns a lambswool cushion into a small, dense brick. Hand-wash anything you are unsure of, or don't buy it.

A tightly woven wool cushion cover will outlast most cotton ones. A loosely knitted one will look tired within a season if it lives on a seat that gets used daily.

Cotton: the one you will actually wash

Cotton is the sensible middle. It is absorbent, strong, widely available and forgiving in the machine — which matters more than most fabric guides admit. A cover you are nervous about washing is a cover that ends up grubby and unloved in a cupboard.

Cotton velvet gives you a soft, dense pile that hides a multitude of sins; brushed cotton gives you the warmth of a winter bedding set in throw form. Plain cotton canvas and twill are the workhorses for kitchen benches, dining chairs and anywhere a mug might land.

Its weaknesses are worth knowing. Cotton holds moisture, so a throw pulled from a cold airing cupboard can feel distinctly chilly until it warms up, and it dries slowly in an unheated room. Strong summer sun will fade a bright cotton cushion left on a window seat, and velvet pile flattens where it is sat on most — usually the front edge of the seat pad, which is exactly where everyone looks.

Buy it for the rooms where things get spilled, sat on and washed. A cotton cover that goes in at 40°C and comes out looking the same is worth more in a busy house than any amount of luxury fibre.

Getting the best from cotton

• Wash at 30–40°C and tumble on low if you must, but line-drying keeps the weave crisp and cuts the ironing.
• Pre-shrink your expectations. Untreated cotton can lose a few per cent in the first hot wash. Check the label before buying a cover for a cushion pad you already own.
• Velvet needs brushing against the pile with a soft brush after washing to lift it back up. Steam helps more than ironing, which crushes it flat.
• Look at the weave, not the thread count. A tight canvas resists pilling and snagging far better than a loose, loosely spun decorative weave.

Linen: cool, dry and better with age

Linen is the one people underrate in Britain because they associate it with hot countries. In fact it is the best summer fabric we have, and it earns its place in a centrally heated flat where July indoors can be stuffier than July outdoors.

Flax fibre is hollow and conducts heat away from the body, so linen feels cool and dry to the touch. It also wicks moisture quickly and releases it just as fast, which is why a linen throw never feels damp the way cotton can. It is the only one of the three that genuinely improves with washing: stiff and papery when new, soft and slightly slubbed after a dozen cycles.

The trade-off is creasing. Linen wrinkles if you look at it, and there is no point fighting it — that relaxed, slightly rumpled look is the whole point. If you want a sharp, crisp cushion, choose cotton or a linen-cotton blend instead.

Living with linen

• Wash warm, not hot, with a full load so the drum cushions the fabric. Linen is strong when wet but abrades against itself.
• Skip the iron or press while slightly damp. A light spray of water and a warm iron on the reverse is enough for a dinner-party cushion.
• Expect slubs and irregularity in natural linen. These are characteristics, not faults.
• Blends are pragmatic. Fifty-fifty linen-cotton creases less and washes harder; linen-viscose drapes beautifully but is the least durable of the three fibres.

Mixing the three across the year

You do not have to choose one fibre and commit. The most useful arrangement in a British home is a layered one, and it takes about thirty seconds to swap over:

1. Summer (June–August): linen cushion covers and a light cotton throw, or nothing at all on the sofa. Pale colours are fine — you are not fighting a dark, damp room.
2. Spring and autumn (March–May, September–October): cotton and linen-cotton blends, plus one lambswool throw folded over an arm for the evenings that turn cold at eight o'clock.
3. Winter (November–February): wool in full. Heavy wool throw on the sofa, wool or wool-blend cushions behind your back, and a brushed cotton or flannel layer against the skin underneath.
4. Storage: wash everything before it goes away, store wool separately from cotton and linen, and leave a little air around the boxes. A damp cupboard in July ruins more textiles than a whole winter of use.

A cushion that survives being washed is worth more than one that only survives being admired. Buy for the life you actually have — crumbs, pets, muddy hands and all.

The short version

Wool for warmth, draughts and rooms you cannot heat properly. Cotton for anywhere a mug, a child or a cat might end up, and for anything you want to wash without thinking about it. Linen for summer, for stuffy flats and for the crumpled, grown-up look that gets better every year.

If you are buying one thing today, buy a wool throw and a couple of cotton covers. Add linen in May, when the heating finally goes off and the room starts to feel close. That is a sofa that works in every month of the year.

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