Store collectible singlets flat — never on hangers — in acid-free boxes, with acid-free tissue between layers and padded folds, in a living-area closet at roughly 68–75°F and 40–57% relative humidity. Keep them away from plastic, mothballs, cedar, and direct sunlight. These are the published standards of museum textile conservators, applied to track and field kit.
A federation-issued singlet is not a t-shirt. It is a lightweight polyester/elastane knit, often carrying heat-transfer lettering that will never be reprinted; once it leaves circulation, there is no replacement. The institutions that keep 200-year-old textiles alive — the Canadian Conservation Institute (CCI), the Smithsonian’s Museum Conservation Institute, the North Carolina Museum of History — publish exactly how they do it. This guide translates their standards into a practical routine.
The core insight from conservation science: textile damage is slow, cumulative, and mostly invisible while it happens. A singlet on a hanger, in a sunny room, inside a plastic bag, looks fine for years — right up until it doesn’t. Preservation means removing those slow stresses before they show.
Key facts · Verified · updated August 2026
- Orientation
- Flat, never on hangers — knits stretch under their own weight (CCI)
- The box
- Acid-free, lignin-free, with acid-free tissue between layers
- Folds
- Padded with tissue — never a hard crease
- Temperature
- ≈70°F ±4 (68–75°F acceptable)
- Humidity
- ≈45% RH ±8 (40–57% acceptable)
- Location
- Living-area closet — never attic or basement
- Keep away
- Plastic, mothballs, cedar, direct sunlight
- Before it goes in
- Clean and fully dry — stains and moisture set in storage
Rule one: store knits flat, never on hangers
Never hang a knit. The Canadian Conservation Institute’s textile-storage guidance is unambiguous on this point: a knit on a hanger spends every hour of every day bearing its own weight, and knits stretch under that load. Flat storage frees the fibers from carrying the garment — which is why CCI recommends it for exactly this category of textile. It is the most important change most collectors can make.
Singlets are among the lightest garments in any wardrobe, which tempts collectors into thinking hanging is harmless. It isn’t — the fabric is also among the most elastic, and elastic knits are precisely what the flat-storage rule exists for. Shoulder points distort first, then the drape of the whole body panel. A stretched singlet never fully recovers.
The archival box: acid-free everything
Museums store flat textiles in acid-free boxes, interleaved with acid-free tissue — a standard shared by the North Carolina Museum of History and archival suppliers alike. The setup for a singlet:
- Acid-free box. Ordinary cardboard is acidic and degrades the fibers it touches over years of contact.
- Acid-free tissue between layers. Line the box and separate garments so dyes and prints never rest directly against each other.
- Padded folds. If the singlet must be folded to fit, roll a soft cylinder of acid-free tissue into each fold. A sharp, unpadded crease concentrates stress along one line of yarns, and over time fibers break exactly along that line. Padding turns a crease into a gentle curve.
Minimize the number of folds, and when you check on the collection, refold along different lines so no single crease becomes permanent.
Climate: where the box lives matters as much as the box
Target about 70°F (±4°F) and 45% relative humidity (±8%) — the Smithsonian’s Museum Conservation Institute’s figures for textile storage. The North Carolina Museum of History gives a compatible home range, 68–75°F and 40–57% RH, and adds the advice that matters most in practice: store textiles in the living areas of your home, never in attics or basements.
| Condition | Target | Source |
|---|---|---|
| Relative humidity | ~45% RH ±8% (40–57% acceptable) | Smithsonian MCI / NC Museum of History |
| Temperature | ~70°F ±4°F (68–75°F acceptable) | Smithsonian MCI / NC Museum of History |
| Location | Living areas — never attic or basement | NC Museum of History |
The logic is simple: attics swing hot and dry, basements swing damp, and both cycle through extremes that stress fibers and invite mold. The closet in a bedroom you actually heat and cool is, environmentally, closer to a museum store than any attic will ever be.
The climate window
A bedroom closet sits naturally inside both bands — which is why conservators say living areas, and never the attic or the basement.
Data table — the climate window
| Condition | Target | Acceptable | Source |
|---|---|---|---|
| Temperature | ≈70°F ±4 | 68–75°F | Smithsonian MCI / NC Museum of History |
| Relative humidity | ≈45% ±8 | 40–57% | Smithsonian MCI / NC Museum of History |
| Location | Living areas | Never attic or basement | NC Museum of History |
Figures per the Smithsonian’s Museum Conservation Institute and the North Carolina Museum of History, as cited in this guide’s sources.
What to keep away from your collection
No plastic bags or plastic boxes
Plastic feels protective. Conservators disagree. The North Carolina Museum of History warns that plastic bags and boxes off-gas plasticizers that harm fibers and can shift dye colors — and, worse for a garment that may hold any trace of moisture, plastic creates sealed microclimates where mold grows. The dry-cleaner bag and the zip-lock are both out. Breathable, acid-free materials only.
No mothballs, no cedar
Both traditional “protections” fail the evidence test. Per CCI’s guidance on basic textile care, mothballs are not a repellent, and their active ingredient is a suspected carcinogen. Cedar fares little better: the vapor has limited effectiveness against pests, and the wood itself is acidic — a cedar chest combines an unproven pest strategy with a harmful storage surface. Good housekeeping and periodic inspection are the museum-standard pest strategy.
No direct sunlight — ever, even briefly repeated
Light damage to textiles is cumulative and permanent. Every hour of exposure adds to a running total that never resets, which is why the NC Museum of History advises keeping textiles out of direct sunlight and rotating or refolding any piece you display. If part of your collection lives on the wall, rotation is not optional — it is how you spread an unavoidable cost across many pieces instead of concentrating it on one. For pieces you display, do it properly: our guide to framing and displaying a singlet without damaging it covers UV-filtering glazing and stitch-mounting.
Before anything goes into storage
Never box a singlet that has been worn without washing it first — sweat is acidic and weakens fibers over time — and never store one that isn’t completely dry, or you are packing mildew conditions into an enclosed box. Wash cold and gentle, inside out, and air dry fully. If the piece carries federation lettering or sponsor logos, follow our guide to caring for printed logos and heat-transfer lettering before it goes anywhere near a box. And inspect as you fold: a snag caught now is a five-minute fix, per our guide to repairing snags and small holes in racing mesh — caught in five years, it may be a run.
The collector’s storage checklist
- Washed cold, air dried completely
- Flat — never hung
- Acid-free box, acid-free tissue, padded folds
- Living-area closet, roughly 68–75°F and 40–57% RH
- No plastic, no mothballs, no cedar
- Out of direct sun; displayed pieces rotated; folds varied at each inspection
Can I hang a singlet just for a few weeks?
The conservation guidance doesn’t carve out exceptions — knits stretch under their own weight whenever they hang, and CCI’s advice is simply to avoid hanging knits. For anything you intend to keep long-term, flat is the default, not the special occasion.
Are vacuum-seal bags a good space-saving option?
No. They are plastic, which conservators warn off-gasses plasticizers and creates mold-friendly microclimates, and they compress the garment into hard creases — the exact stress that padded folds exist to prevent.
How often should I check on stored singlets?
Periodically — use each check to confirm the pieces are clean and dry, look for any pest activity, and refold along different lines so no crease sets permanently. Rotation and refolding are part of the NC Museum of History’s standard advice for textiles.
Do I really need a climate-controlled room?
Not a dedicated one. The Smithsonian’s targets (~45% RH, ~70°F) overlap with what a normal, occupied home already provides. That is exactly why the guidance says to store textiles in living areas: your bedroom closet qualifies, your attic and basement do not.
Should I store a match-worn singlet differently from a new one?
The materials and climate rules are identical, but a worn piece must be washed and fully dried first — perspiration is acidic and keeps weakening fibers in storage — and it deserves more frequent inspection.
The pieces worth this level of care are the ones that can’t be replaced. Browse our catalog of authentic pro elite track and field apparel and rare international team singlets — and when the box arrives, you’ll know exactly where it should live.