How to Wash Workout Clothes the Right Way (And Make Them Last)

No fabric softener, cold water only, and air drying: those three changes do most of the work of keeping leggings, sports bras, running tops and shells fresh and stretchy. Everything below explains why, then covers the pieces that need different handling.

Related: 10 Sustainable Activewear Brands Leading the Way in 2026.

What a normal wash does to technical fabric

Wicking. Polyester and nylon performance knits move sweat off your skin and spread it out so it evaporates. Liquid softener and dryer sheets leave a waxy film on those fibers. Enough of it and the shirt holds sweat against you instead.

Stretch. Spandex (elastane, Lycra) is what makes leggings recover and compression gear compress. Hot washes and hot dryers break it down. The damage adds up and doesn't reverse, which is why leggings bag at the knees.

Odor treatments. Many brands add an antimicrobial finish. It washes out gradually on its own, and bleach, harsh detergents and high heat speed that up.

Water repellency. The DWR finish on running jackets makes rain bead and roll off. Dirt, body oil and some detergents cover it so it stops working, even though the coating is still there.

The routine, in order

Start with the care label. The FTC's Care Labeling Rule requires it to state how to wash and dry the garment and to warn about anything that would damage it, such as "Do not iron", so where the label is stricter than the steps below, follow the label.

1. Don't leave them balled up

Sweaty clothes sitting in a gym bag are where the smell sets in, and the longer they sit the deeper it goes. If you can't wash right away, hang them over a rack, the shower rail or a chair back so they dry out.

2. Turn everything inside out

Sweat, skin oil and dead skin collect on the inside, the side against your body. Inside out puts that surface in direct contact with water and detergent, and it protects prints and reflective details on the outside.

3. Soak anything that still smells

If regular washing doesn't shift the smell, soak the piece for 30 minutes in one part white vinegar to four parts cold water, then wash as normal. Vinegar is mildly acidic and breaks down the compounds bacteria leave behind without harming synthetics.

Baking soda is the other option: half a cup straight into the drum before the clothes. Use one or the other, not both in the same wash, because they cancel each other out.

4. Cold water, every time

Hot water wears out spandex faster, fades color and can set sweat stains. Cold water cleans synthetics fine, particularly with a detergent made for them.

5. Pick a detergent and measure it

Ordinary detergent is fine for lightly worn gear. Sport detergents are aimed at what ordinary ones leave behind in tight synthetic knits: skin oil, bacteria sitting in the fibers, and residue from earlier washes.

Availability check, October 29, 2026: The HEX Fresh Scent 100-load two-pack (B0F1QDKF3S) was unavailable. The Lavender Scent two-pack (ASIN B0F1QHCYD2) was in stock from HEX Performance, LLC; both list 100 total loads, and the alternative lists two 50 fl oz bottles. It has a different fragrance. Follow the selected product’s dosing instructions and check its current offer.

Common choices are Hex Performance Lavender, Tide Plus Febreze Sport and WIN; you may also see Nathan Sport Wash, though its listing comes and goes. Whichever you use, stick to the dose on the label. Extra detergent doesn't rinse out, and the residue attracts dirt and holds bacteria.

6. Gentle cycle, half-full drum

A gentle or delicates cycle agitates less, which is easier on elastic and still gets things clean. If your machine has a sport or activewear setting, use that. Don't pack the drum: clothes need room to move, and a crammed load washes unevenly and leaves detergent behind.

7. No softener, no dryer sheets

This is the most common mistake, so it gets its own step. Softener and dryer sheets both coat the fibers, which blocks wicking, traps odor-causing bacteria, cuts breathability and weakens antimicrobial finishes. If static bothers you, wool dryer balls do the job without the coating.

8. Air dry

Hanging to dry keeps spandex springy and the fabric in shape. Lay compression pieces flat so the weight of the water doesn't stretch them. If you have to use the dryer, use the lowest heat and take things out as soon as it stops. Never high heat.

Bras, shoes, merino and rain shells

Sports bras. Compression fabric, elastic bands and molded cups all dislike heat and agitation. Hook the clasps, put the bra in a mesh bag, wash on gentle and air dry. When the band no longer holds firm, the bra is done; for one worn several times a week, the usual guide is six to twelve months.

Running shoes. Take out the insoles and laces and wash them separately. Stuff the shoes with newspaper or paper towel and dry them at room temperature. Keep them out of the dryer: heat deforms midsole foam and can unglue bonded parts.

Merino. More delicate than synthetics. Use a wool or delicates cycle with a wool detergent such as Eucalan or Soak, and dry flat, never in the dryer. Because merino resists odor on its own, you can usually wear it two or three times between washes, which is easier on the fiber.

DWR jackets and pants. Use a technical wash such as Nikwax Tech Wash, which cleans without leaving residue. Then tumble dry on low for 20 minutes; the heat reactivates the water-repellent finish. If water still doesn't bead afterwards, the finish needs a reproofing product.

Four habits that wear gear out early

Too much detergent. It doesn't all rinse out, and the residue becomes a permanent source of smell. Use the label dose, or a little less for a small load.

Washing with jeans and towels. Heavy fabrics rub against lightweight knits, which pills the surface, snags the yarn and can damage compression panels. Wash activewear on its own or with other light synthetics.

Leaving a wet bag in the car. A damp gym bag in a warm trunk grows bacteria fast, and that smell can stay in synthetic fibers for good. Airing things out between the workout and the wash prevents most of it.

Bleach. Chlorine bleach damages spandex and strips antimicrobial finishes, and even color-safe bleach is hard on technical fabric. To disinfect, use white vinegar or an oxygen brightener such as OxiClean.

How often to wash what

Anything that touched your skin during a sweaty session gets washed after every wear: tops, shorts, tights, sports bras, socks. Jackets and vests worn over other layers can go three to five wears, depending on conditions, and washing them less often keeps the DWR working longer.

When a piece is finished

Good care slows wear down; it doesn't stop it. Replace a piece when you see any of these:

• A smell that survives washing and a vinegar soak
• Lost stretch: compression that no longer compresses, leggings that sag
• Pilling that makes the fabric rough against your skin
• Fabric that stays wet and clammy instead of drying quickly
• Thinning fabric, holes or seams coming apart

Frequently Asked Questions

What is the best way to wash workout clothes without damaging the fabric?

Inside out, cold water, gentle or sport cycle, label dose of detergent, then air dry. Heat breaks down spandex, and softener or dryer sheets clog the fibers that make synthetics wick. Keep them away from jeans and towels, which cause pilling and snags.

How do I get the smell out of workout clothes?

Soak them for 30 minutes in one part white vinegar to four parts cold water, then wash as normal. Half a cup of baking soda in the drum is the alternative, but don't use it with vinegar, because they neutralize each other. A sport detergent such as HEX Performance goes after the skin oil and bacteria that hold odor.

Can you put workout clothes in the dryer?

Only on the lowest heat, and take them out as soon as the cycle ends; air drying is better because heat damage to spandex is cumulative and permanent. The exception is DWR-treated jackets: 20 minutes on low after washing reactivates the water-repellent finish.

Should you use fabric softener on activewear?

No. Softener and dryer sheets coat the fibers, which blocks wicking, traps odor-causing bacteria, reduces breathability and weakens antimicrobial finishes. Use wool dryer balls if static is the problem.