How to Store Winter Gear in the Off-Season Without Ruining It

More winter gear is destroyed in the wardrobe between April and November than on any mountain. The failure modes are quiet — crushed loft, larvae in the merino, cracked boot midsoles — and every one of them is preventable in an afternoon.

The two rules that cover everything

1. Store everything clean. Body oils, sweat and dirt keep degrading fabric all summer: they attract moths to wool, feed mildew in damp corners, and slowly break down down clusters and DWR coatings. A garment stored dirty ages several seasons in one.
2. Store everything dry and uncompressed. Moisture plus a sealed container is a mildew recipe; long-term compression is how insulation dies. Cool, dry, dark, and loose is the target for every single item below.

Pick the location before the container

Most storage damage is really location damage. The four usual candidates:

If the garage or basement is your only option, run a dehumidifier or large desiccant tubs nearby, get everything off the concrete floor (moisture wicks up through it), and accept that sealed containers become mandatory — meaning the contents must go in bone-dry.

Down jackets and parkas

Down survives decades if it spends the off-season lofted. Left compressed in a stuff sack for six months, the clusters take a set and never fully recover — the jacket comes out of storage measurably colder.

• Wash it first (technical down wash such as Nikwax Down Wash Direct or Grangers, thorough rinse, tumble dry low with dryer balls until completely dry — a damp core mildews in storage). Drying down properly takes two to three hours of low-heat cycles; if any clump feels cool or dense when you squeeze it, it's still wet inside.
• Hang it on a wide hanger in a wardrobe, or lay it loosely in a large breathable cotton storage sack. Sleeping-bag owners know these as "storage sacks" — the enormous mesh or cotton bags that come with good bags. Same principle.
• Never: vacuum bags, stuff sacks, sealed plastic boxes. Six months of vacuum compression can cost a down piece a chunk of its loft permanently. The vacuum bag is the single most common storage mistake, usually justified by space-saving — a flattened €400 parka is an expensive way to free up a drawer.

Synthetic insulation is more forgiving but follows the same rule — loose beats compressed, every time.

Merino and wool

Clothes moths eat protein fibres — wool, cashmere, down, even silk — and they find dirty textiles first: sweat and skin flakes are the attractant, and it's the larvae, not the adult moths, that do the eating. The counter-measures, in order of effectiveness:

1. Wash everything before storage. This alone prevents most infestations.
2. Store in sealed containers or zip bags — this is the one category where airtight is right, because the enemy is insects, not moisture (wool must go in bone-dry).
3. Cedar blocks and lavender are mild deterrents, not pesticides. They help; they don't rescue a dirty jumper in an open drawer. Cedar also loses its scent within months — sand the blocks lightly each season to refresh them.

If you find holes or webbing when packing up, don't just wash the affected piece — eggs and larvae spread. Wash or freeze everything from that drawer (a few days in a chest freezer, bagged, kills all life stages; a 60 °C wash does too, but most wool can't take it), and vacuum the drawer or shelf itself, especially the corners and cracks.

Fold wool rather than hanging it — heavy knits stretch on hangers. If you must hang a wool coat, use a wide contoured hanger and check it isn't shouldering its own weight into points.

Hardshells and softshells

Wash with technical cleaner, re-up the DWR if the sprinkle test fails (do it now, not next November), and hang them dry before storage. Shells can hang all summer or lie folded in a breathable bin; they don't care about compression the way insulation does. What they do care about is heat: don't store membrane jackets in a hot attic or a car boot — sustained heat ages seam tape and laminates. If the seam tape is starting to lift, summer is the time to send it for warranty or repair, not the first cold week of December.

One more shell-specific point: store them clean of sunscreen and insect repellent. DEET in particular attacks polyurethane coatings, and a smear left on a collar keeps working on the fabric for months.

Winter boots

• Clean off road salt with a damp cloth and a splash of vinegar — salt left on leather draws out moisture and cracks it over the summer. White tide lines mean salt is already in the fibres; wipe until they stop reappearing.
• Dry them fully, open, with the footbeds pulled out. Never on a radiator; heat delaminates soles and warps leather.
• Condition leather boots (wax or cream), then store them somewhere ventilated with boot trees or stuffed newspaper — not sealed in the plastic tub in the damp garage, which is a mould programme.
• Store upright, not with one boot crushed under a bin of skates. Pack-style boots with removable felt liners: pull the liners and store them separately so both parts air fully.

Boots with polyurethane midsoles (most hiking and many winter boots) have a quieter enemy: hydrolysis. PU midsoles degrade chemically over years whether worn or not, and damp, unventilated storage accelerates it. A boot that sat sealed in a humid garage for three summers can crumble at the midsole on its first day back out. Ventilated, dry storage is the counter-measure — and boots that get worn occasionally outlast boots that sit.

Hats, gloves, gaiters, socks

Wash the lot (glove liners and hats absorb a full season of skin oil), dry completely, and store together in one labelled breathable bin. Leather gloves and mitten palms get a light conditioning like boots do. The point of "together" is next November: the season starts the day the temperature drops, and the family that can find both mittens of every pair on day one is running a different operation from the one digging through three boxes.

The 30-minute spring checklist

1. One washing-machine load of technical fabrics with the right cleaner; one of wool.
2. Down items fully dried and hung, not stuffed.
3. Wool sealed clean and dry.
4. Boots cleaned, conditioned, stored ventilated.
5. Anything broken — zips, seam tape, blown DWR — repaired now, in the repair off-season, while turnaround is fast.

FAQ

Can I use vacuum bags for anything? Shells and non-insulated trousers tolerate them, though creasing coated fabrics hard for months isn't ideal. Never for down, synthetic insulation or lofted fleece. If space is that tight, hang the insulation and vacuum-bag the flat items.

Do mothballs work? Yes, but they're a pesticide (naphthalene or paradichlorobenzene) with a smell that outlasts the summer and real toxicity concerns around children and pets. Clean wool in a sealed container achieves the same protection without fumigating your wardrobe.

Should I wash a down parka that looks clean? Yes. The grime that kills loft is invisible — skin oil at the collar and cuffs wicks along the down over months. Once a season minimum, and always before storage.

Is it worth re-waterproofing in spring rather than autumn? Do it whenever the shell stops beading, but spring has two advantages: the DWR cures onto a freshly cleaned garment, and you find out now if the jacket needs repair rather than during the first cold snap when every repair service is backed up.

The one-line answer

Clean, bone-dry, uncompressed, cool and dark. Down loose, wool sealed, boots conditioned — and next winter starts with gear that works instead of a restoration project.