The Case for Cold Water, Cedar, and a Little Patience

Start with what wool actually is. Each fibre is a scale-covered shaft, and those scales are what cause felting. When wool is wet and agitated, the scales interlock and refuse to let go. This is the entire reason for careful washing. Heat and movement are the enemies, not water itself. A wool jumper submerged in cold water and left alone will come out fine. The same jumper thrashed through a hot cycle will come out a size smaller and permanently dense.

For most knitwear, a cold water hand wash is the safest route. Fill a basin, add a capful of a pH-neutral wool detergent, and let the garment soak for ten minutes without rubbing. Press the suds through gently, then rinse in water of the same temperature. A sudden shift from warm to cold shocks the fibres. If your machine has a proper wool cycle, one that limits agitation and spin, it is trustworthy for sturdier lambswool and Shetland. Reserve the basin for cashmere and fine merino, which have less to give.

Understand what lanolin does. It is the wax wool carries naturally, and it repels water and dirt. Harsh detergents strip it, which is why wool washed too often or too aggressively starts to feel dry and lifeless. Some wool washes are formulated to leave lanolin intact. This matters most for garments you want to wash rarely, which should be all of them. Wool is self-cleaning to a degree. Air a jumper overnight and the smell of a single wear usually disappears.

Drying is where garments are saved or lost. Never hang wet wool. The weight of the water pulls it out of shape and you cannot recover the original line. Lay it flat on a towel, gently reshape it to its proper dimensions, and let it dry away from radiators and sun. This is blocking, and it is how you keep a collar square and a sleeve the right length. A mesh drying rack speeds things without distorting anything.

The fibres themselves want different things. Merino, being fine, felts easily and needs the gentlest hand. Shetland and lambswool are hardier and forgive a machine cycle. Cashmere is the most delicate of the knits, and it pills as the shorter fibres surface, which a cashmere comb removes without drama. Harris Tweed, woven rather than knitted, rarely needs washing at all. Brush it, spot-clean it, and send it to a specialist dry cleaner once a year if it needs more.

Storage is the long game. Fold knitwear rather than hanging it, since hangers stretch shoulders. Keep it clean, because moths are drawn to the traces of skin and sweat left in worn wool, not the wool itself. Skip mothballs, which smell of the 1950s and are toxic besides. Cedar blocks and lavender sachets deter moths well enough if you refresh the cedar with sandpaper every few months. Check your stored wool periodically. Small holes, fine webbing, or a scattering of what looks like sand mean moths have arrived, and early action saves the rest of the drawer.