How to Wash & Care for Activewear Without Ruining It
| Quick answer: To wash activewear correctly turn it inside out, wash cold (30°C / 86°F) on a gentle cycle, skip the fabric softener, and air dry flat. Never tumble dry. These five steps preserve the moisture-wicking fibres, keep elastic from degrading, and prevent the persistent odour that ruins gym clothes long before they physically wear out. |
You spent real money on your activewear. Quality gym shorts, yoga leggings, sports bras, and running tops are built to last — but only if you wash them correctly. The wrong cycle, the wrong detergent, or the wrong drying method can destroy the moisture-wicking finish, shrink the elastic waistband, or bake in sweat odour permanently within just a few washes.
This guide covers everything you need to know — the exact wash routine, what to avoid, how to remove stubborn odour, and a quick-reference care chart by fabric type.
Why Activewear Needs Different Care to Regular Clothes
Most activewear is made from synthetic performance fabrics — polyester, nylon, elastane (spandex), or blends of all three. These materials are engineered to do things cotton cannot: wick moisture away from skin, stretch in four directions, and snap back to shape after thousands of movements.
The problem is that the same structure that makes these fabrics perform also makes them vulnerable to the wrong care:
- Heat destroys elastane. The elastic fibres that give leggings and sports bras their stretch degrade permanently at high temperatures. Tumble drying or hot washing is the fastest way to turn fitted activewear into saggy, shapeless fabric.
- Fabric softener clogs performance fibres. Softener deposits coat the microscopic channels in moisture-wicking fabric. Your gym kit feels softer for one wash, then loses its ability to pull sweat away from skin entirely.
- Sweat + heat = permanent odour. Bacteria that cause that sour gym smell embed themselves in synthetic fibres. If you wash activewear on a hot cycle, you bake that bacteria into the fabric permanently rather than removing it.
- Agitation causes pilling. High-spin cycles and rough tumble drying create surface friction that pulls individual fibres into the small balls (pills) you see on old gym kit. Gentle cycles and air drying prevent this.
Step-by-Step: How to Wash Activewear Correctly
Follow these six steps every time and your activewear will last years longer than pieces treated like regular laundry.
| Step 1: Act Quickly — Don’t Leave It Damp
The biggest mistake people make happens before the washing machine is even switched on. Leaving sweaty activewear balled up in a bag, on the floor, or at the bottom of a laundry basket lets bacteria multiply deep inside the fibres. What to do: Either wash immediately after your session or hang the kit up to air-dry in an open space. Never seal sweaty activewear in a closed bag or laundry bin. |
| Step 2: Turn Everything Inside Out
The inner surface of your activewear is where sweat, bacteria, and body oils actually accumulate. Turning clothes inside out puts the dirtiest surface in direct contact with the water and detergent, rather than the outer printed or coloured face. It also protects the outer surface from abrasion inside the drum — reducing pilling and colour fade on printed designs and darker fabrics. |
| Step 3: Cold Wash — 30°C / 86°F Maximum
Set your machine to cold or a maximum of 30°C. This is the single most important rule. Why: Heat is the main enemy of elastane. Even one hot wash (60°C+) can cause the elastic fibres in your leggings or sports bra to partially degrade — and once they go, the fabric sags and never fully recovers its shape. Cold water cleans performance fabrics just as effectively as hot water for the bacteria and body oils that accumulate during workouts. |
| Step 4: Use a Gentle Cycle & Skip the Fabric Softener
Select the gentle or delicates cycle on your machine. High-spin cycles create unnecessary abrasion between garments and the drum, accelerating wear on elastic and surface fibres. Use a small amount of regular detergent — not fabric softener, not dryer sheets. Fabric softener leaves a coating on moisture-wicking fibres that permanently reduces their ability to manage sweat. If you want extra freshness, add a splash of white vinegar to the rinse cycle instead — it neutralises bacteria without damaging performance fabrics. |
| Step 5: Rinse Thoroughly
Make sure the machine completes a full rinse cycle. Detergent residue left in performance fabric can irritate skin during your next session and over time builds up as a layer that reduces breathability. If you hand wash, rinse under cold running water until the water runs completely clear with no suds. |
| Step 6: Air Dry Flat — Never Tumble Dry
Remove activewear from the machine promptly and either lay it flat on a clean dry surface or hang individual items on a drying rack. Avoid direct sunlight for coloured items — UV fades dye in performance fabrics faster than in natural fibres. Never tumble dry. Even a low-heat tumble dry cycle degrades elastic over time and causes pilling. The few minutes it saves are not worth the reduction in lifespan. Most quality activewear air-dries within 1–2 hours at room temperature — much faster than cotton, which is one of the practical advantages of synthetic performance fabrics. |
Quick Reference: Do This, Not That
| Avoid This | Do This Instead |
| ❌ Hot wash (40°C+) | ✅ Cold wash — 30°C maximum |
| ❌ Tumble dry on any setting | ✅ Air dry flat or on a rack |
| ❌ Fabric softener | ✅ Small amount of regular detergent |
| ❌ Leaving sweaty kit in a bag | ✅ Air out immediately after use or wash straight away |
| ❌ High-spin cycle | ✅ Gentle or delicates cycle |
| ❌ Washing with rough denim or zipped items | ✅ Separate activewear from abrasive fabrics |
| ❌ Direct sunlight when drying | ✅ Shade or indoor drying rack |
| ❌ Storing damp | ✅ Only store when fully dry |
How to Remove Sweat Smell from Gym Clothes
If your activewear still smells after washing, the bacteria causing the odour are embedded deep in the synthetic fibres — likely from repeated hot washes or being stored damp. Here is how to fix it:
White Vinegar Soak Method (Recommended)
- Fill a basin or sink with cold water.
- Add 250ml (1 cup) of white vinegar — not apple cider vinegar, which can stain.
- Submerge the activewear completely and soak for 30 minutes.
- Do not rinse — put it straight into the washing machine on a cold gentle cycle.
- Air dry as normal.
White vinegar is acidic enough to kill the bacteria causing odour without damaging performance fibres or elastic. One or two treatments usually resolves persistent smells even on kit that has been washed incorrectly for months.
| ⚠️ Do not use baking soda on elastane fabrics. While it works for cotton, baking soda is mildly abrasive and can weaken elastic fibres with repeated use. Stick to white vinegar for synthetic gym kit. |
Activewear Care Guide by Fabric Type
Different fabrics need slightly different handling. Use this chart as a quick reference:
| Fabric | Wash Temp | Spin | Dry | Special Note |
| Polyester | Cold 30°C | Gentle | Air dry | Most common in gym shorts & T-shirts. Resists shrinking. |
| Nylon | Cold 30°C | Gentle | Air dry | Used in yoga sets & leggings. Dries very quickly. |
| Elastane / Spandex | Cold 30°C | Gentle | Air dry flat | In all stretchy items. Most heat-sensitive. Never tumble dry. |
| Nylon-Elastane blend | Cold 30°C | Gentle | Air dry flat | Yoga leggings & sports bras. Handle as elastane. |
| Polyester-Elastane | Cold 30°C | Gentle | Air dry flat | Running shorts & gym kits. Same rules as elastane. |
| Cotton blend | 30–40°C | Normal | Air dry or low tumble | Less heat-sensitive than pure synthetics but still avoid hot washes. |
How Often Should You Wash Activewear?
The short answer: after every single session, without exception. Here is why that matters more for synthetic performance fabrics than for regular clothes:
- Bacteria multiply fast in synthetic fibres. Unlike natural fibres such as merino wool, polyester and nylon do not have antibacterial properties. Within hours of a sweaty session, bacterial colonies grow and embed themselves in the fabric — making odour progressively harder to remove with each wash you delay.
- Body oils degrade elastic. The natural oils in your skin break down elastane fibres over time. Washing after each session removes them before they can cause lasting damage.
- One wash = no permanent smell. Bacteria washed out within 12–24 hours of a session leave no lasting odour. Wait 48+ hours and the odour starts to bake in permanently.
| Exception: If you wore a jacket or top for a 20-minute walk but did not sweat, it is fine to air it out and wear again. The rule applies to any item that has been worn against skin during a genuine workout. |
5 Signs Your Activewear Needs Replacing
Even with perfect care, activewear does not last forever. These are the signs it is time to replace rather than keep washing:
- Persistent odour that survives the vinegar soak — the bacteria are permanently embedded. The item is done.
- Visible sagging at the waistband or seat — the elastane has degraded and will not recover.
- Pilling across the thighs or underarms — surface fibres are breaking down. The fabric will continue to deteriorate.
- The fabric has become see-through — the weave has thinned from overuse or incorrect washing.
- Loss of shape after washing — the item no longer snaps back to its original form when laid flat.
Ready to replace worn-out kit? Browse the full Men’s Activewear and Women’s Activewear collections at Lionel Goods.
Frequently Asked Questions
Can you put activewear in the dryer?
No — not if you want it to last. Even a low-heat tumble dry cycle degrades elastane fibres over time and accelerates pilling. Air drying is always the right choice for activewear. Most synthetic performance fabrics dry in 1–2 hours at room temperature, so you are not waiting long.
Why does my activewear still smell after washing?
This usually means the kit has been washed on too high a temperature, stored damp before washing, or treated with fabric softener that has built up over time. Try the white vinegar cold soak method described above — soak for 30 minutes in cold water with one cup of white vinegar, then machine wash cold without rinsing first. One or two treatments should resolve persistent odour.
Should I wash activewear inside out?
Yes, always. The inner surface is where sweat, bacteria and body oils accumulate during a workout. Washing inside out puts that surface in direct contact with detergent and water, while protecting the outer printed or coloured face from abrasion inside the drum.
Can I use fabric softener on gym clothes?
No. Fabric softener deposits a coating on the microscopic moisture-wicking channels in performance fabric. After even a few washes with softener, your activewear loses its ability to wick sweat away from the skin and dries more slowly. If you want extra freshness, use white vinegar in the rinse cycle — it does not damage performance fibres.
How often should I wash activewear?
After every single workout session where you sweat. Unlike regular clothing, activewear worn against skin during exercise should never be worn twice without washing in between. The bacteria that cause persistent gym-kit odour multiply within hours and embed permanently in synthetic fibres if not washed promptly.
Shop Long-Lasting Activewear at Lionel Goods
The best way to get years out of activewear is to start with quality fabric. Lionel Goods stocks men’s and women’s performance activewear in polyester, nylon, and nylon-elastane blends — built to withstand correct care and perform session after session.
Shop Men’s Activewear → | Shop Women’s Activewear →
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