Washing Sportswear: How to Protect the Technology and Keep It Smelling Fresh

Today's sportswear isn't just cotton — it's a technical fabric with a functional layer. That layer wicks moisture away from your skin so your body can cool down more efficiently, keeps snow from soaking through and reduces wind resistance. But it's also fairly delicate: a single wrong wash with fabric softener, and your expensive sports top loses its performance properties. In this article: how to wash sportswear properly, how to get rid of ingrained sweat odour, and how washing differs by type of sport.

What makes sportswear special

Modern sportswear features one or more of these technologies:

• Moisture-wicking (a layer that draws moisture away) — Dri-FIT, Climalite, ClimaCool, HEAT.RDY
• Waterproof / windproof — GORE-TEX, Pertex membranes
• Compression — stretch fibres (Lycra/Spandex) that reduce muscle vibration
• Antimicrobial layer — silver nanoparticles or other anti-bacterial technologies
• UV protection — a UPF 30/50+ layer
• Reflectiveness — reflective details for visibility at night

All of these layers can be damaged by the wrong washing routine. The main threats:

• Fabric softener — coats the functional layer
• High temperatures — damage the adhesives in membranes
• Optical brighteners — build up in the fibres and dull the colours
• Tumble dryer heat — can damage stretch fibres

The key washing rules

1. NEVER use fabric softener

This is the most important rule. The cationic surfactants in fabric softener settle on the surface of the fabric and coat the moisture-wicking layer. After a few washes with softener:

• The fabric starts absorbing moisture instead of wicking it away
• Your top looks "athletic" but feels like cotton
• Sweat odour soaks in more easily
• Colours fade faster

Find out more about using fabric softener in our fabric softener guide.

2. Wash at a low temperature

30 °C is the optimal setting:

• Enough to remove sweat and bacteria (with the right laundry detergent)
• Protects technical layers from heat damage
• Protects stretch fibres
• Reduces colour fading

40 °C is the maximum for most sportswear. 60 °C — ONLY if the manufacturer explicitly allows it (usually they don't).

3. Use an enzyme laundry detergent

Sportswear comes with a specific washing challenge: sweat proteins. An enzyme laundry detergent with proteases removes them effectively, even at 30 °C. Ecozyme enzyme laundry detergent is a good fit because it has:

• No optical brighteners (protects colours)
• Effectiveness from 20 °C
• No harsh surfactants that could damage the fibres

4. Reduce the dose

20-25 ml of enzyme laundry detergent is enough for sportswear. Too much leaves residue that blocks the moisture-wicking layer, much like fabric softener does.

5. Always use an extra rinse

Most modern washing machines have an "extra rinse" function. For sportswear it's a must. It ensures no laundry detergent residue is left in the fibres.

6. Wash garments inside out

This does three things:

• Protects the outer colour layer from friction
• Reaches sweat residue more effectively (it builds up on the inside)
• Protects logos, reflective details and any applied decorations

7. Wash separately from cotton clothes

Cotton sheds lint that sticks to synthetic sports fabrics. Cotton is also often washed at higher temperatures, whereas sportswear needs a low one.

The problem of ingrained sweat odour

A typical scenario: you wash your sports tops by the book, but the sweat smell still lingers. Why?

Synthetic fibres (polyester, nylon) have a microscopic "memory" for sweat compounds. The bacteria responsible for odour (mainly Corynebacterium) attach more firmly to synthetic fibres than to cotton. The odour molecules penetrate deep into the fibres and aren't released into the water during a normal wash.

The solution: a vinegar + soda pre-soak

1. Fill a bucket or bowl with cold water
2. Add 100 ml of white vinegar + 1 tablespoon of washing soda
3. Soak the garments for 30-60 minutes
4. Wash at 30 °C with enzyme laundry detergent

The acetic acid neutralises the sweat compounds, while the soda raises the pH and helps release odour molecules from the fibres.

A stronger option: a hydrogen peroxide pre-soak

For well-worn sportswear with ingrained odour:

1. Soak in cold water with 200 ml of 3% hydrogen peroxide
2. Leave for 1 hour
3. Wash as usual

Hydrogen peroxide oxidises odour molecules and kills bacteria. But: for white and light fabrics — yes; for dark or brightly coloured fabrics — test on a hidden area first, as it may slightly alter the colour.

Tips by type of sport

Running and athletics

Mostly moisture-wicking kit. The standard approach is enough. Wash after every run (sweat oxidises quickly).

Cold-weather sports (skiing, mountaineering)

GORE-TEX and other waterproof membranes:

• Specialist cleaners (Nikwax Tech Wash, Granger's) — a better choice than a regular enzyme laundry detergent
• NEVER use fabric softener
• 30 °C, no peroxide
• Reapply a water-repellent treatment (DWR) every 6-12 months

Swimwear

Lycra/Spandex fibres are sensitive to chlorine and sun cream:

• Rinse in cold water IMMEDIATELY after use
• Wash at 30 °C with enzyme laundry detergent, at a reduced dose
• NEVER dry in direct sunlight (UV damages stretch fibres)
• NEVER tumble dry — heat damages elastane

Yoga / Pilates (compression wear)

A lot of elastane. As with swimwear, avoid hot drying. Air-drying is best.

Combat sports (BJJ, MMA gis)

Heavy cotton fabrics with a sweat problem. The approach:

• Wash at 40 °C (fine for cotton)
• Pre-soak with vinegar (60 min)
• A full dose of enzyme laundry detergent + 10 ml on the underarm area
• Air-dry

Cycling kit

Lycra + reflective details. Take care: aggressive washing damages the reflective film.

The smell comes back even after washing correctly: what to do

If the sweat smell returns after a few hours of wear (not during exercise), it's a clear sign that bacteria are still in the fibres. Solutions:

1. A hydrogen peroxide "nuclear" soak — 1 hour in 3% peroxide in cold water
2. Essential oils in the pre-soak — 10-15 drops of tea tree oil in a bucket of water with laundry detergent (antimicrobial effect)
3. UV light — a few hours of sunlight disinfects naturally
4. The last resort — replace the garment. After 50-100 washes, some synthetic garments lose their resistance to bacteria and the smell will keep coming back however you wash them.

What NOT to do

• Don't use chlorine bleach — it damages elastane and colours
• Don't use fabric softener — it coats the functional layer
• Don't dry on a radiator or heater — it damages membranes
• Don't iron sportswear — most membranes can't withstand the heat
• Don't tumble dry without checking the label — most sportswear needs low heat or air-drying only
• Don't leave wet sports kit in your bag — bacteria multiply exponentially

Frequently asked questions

Is it worth buying a special sportswear laundry detergent?

In most cases — no. A good enzyme laundry detergent with a low fragrance content does the same job. Specialist sports cleaners (Nikwax, Granger's, Sport Wash) are needed for specific purposes: GORE-TEX membranes, reproofing DWR, and professional-level sportswear.

Can I use laundry vinegar instead of fabric softener?

It depends on the kit:

• Basic sportswear — yes, 50 ml of white vinegar in the softener compartment is fine
• GORE-TEX and premium membranes — best not, as it may slightly reduce water resistance

How often should I wash sportswear?

After every intense session. Sportswear left sweaty for even a day allows bacteria to "settle in" deeper in the fibres, and the odour becomes resistant to normal washing.

My sportswear still smells after 5 washes. What should I do?

If the standard approach doesn't help — try a hydrogen peroxide soak (1 hour). If that doesn't work after 2-3 attempts either, the garment has probably reached the end of its useful life.

Do I really need to wash garments inside out?

For sportswear — yes, it's recommended. It protects the outer colour and reaches the areas where sweat builds up (underarms, back) more effectively.

Summary

Washing sportswear is a fine balancing act: strong enough to remove sweat and bacteria, but gentle enough not to damage the technical layers. The key rules: NEVER use fabric softener, a low temperature (30 °C), enzyme laundry detergent at a reduced dose, an extra rinse, and garments turned inside out. For ingrained odour — a vinegar / hydrogen peroxide pre-soak. With this routine, your sportswear will keep performing for much longer.