Sneakers are the clearest case of a rule that runs through this whole category list: what protects a thing for three days in a parcel ruins it over three years on a shelf.
What actually destroys them
Light. Midsoles yellow under UV, and it does not come back. A sunny shelf is the single most expensive place to keep a pair.
Heat. Adhesives soften and, over years, give up. A metal cupboard against a west wall in May is an oven.
Humidity. Mould on uppers and inside the lining, which in a monsoon takes weeks rather than years.
What to do instead
- Out of direct light. A box, a cupboard, anything opaque.
- Not against an outside wall, which is where heat and damp arrive first.
- Silica gel in the box, replaced when it is spent. It costs very little and it is the whole defence.
- Stuffed lightly with acid-free paper or plain paper, so the toe box holds its shape.
- Not in a sealed plastic bag. This is the opposite of what the packing guide tells you for transit, and deliberately so: sealed plastic traps moisture against the upper for months.
The well-meant mistake
Wrapping a deadstock pair in cling film "to keep them fresh". It holds moisture in, and in an Indian summer that is how a stored pair comes out mouldy.
What it costs
Almost nothing. Silica sachets, a shelf out of the sun, and an inside wall. The expensive version — a dehumidified room — is for a collection, not a pair.
Questions people ask
Does yellowing come out?
Treat it as permanent. Prevention is the only real answer.
Should I keep the box?
For anything collected, yes — and store the box out of damp too, since cardboard is the first thing to go soft.
How often should I check?
Once at the start of the monsoon and once after. That is enough.