Your activewear is probably the most expensive clothing per item in your wardrobe. A decent pair of training shorts or a compression top isn't cheap. And if you're washing it the same way you wash your regular clothes, you're slowly destroying it.
Here's how to wash activewear properly so it lasts longer, performs better, and doesn't stink.
Why activewear needs different treatment
Activewear fabrics like polyester, nylon and elastane are engineered with specific properties: moisture wicking, four-way stretch, compression, quick drying. Those properties come from the fabric's structure and finish, and aggressive washing breaks them down.
There's a second problem that cotton doesn't have. Synthetic fibres are oil-loving, so the body oils and sweat proteins you leave behind after a session cling to them rather than rinsing away. That residue feeds odour-causing bacteria, which is why a top can come out of the machine smelling fine and then turn the moment you start sweating in it. If that sounds familiar, our guide to why gym clothes stink after washing covers what's actually happening in the fibres.
Regular detergent, hot water, fabric softener and tumble drying all degrade performance fabrics over time. The stretch goes, the wicking stops working and the fit loosens. That expensive training top starts feeling like a cheap t-shirt after a few months.
How to wash activewear: the seven rules
1. Use a sports-specific detergent. Regular detergent is formulated for cotton and everyday fabrics. It leaves residue in synthetic fibres that traps bacteria and reduces wicking performance. Titan Wash is built for sportswear: a high enzyme complex breaks down the sweat proteins that cause lingering odour, zinc ricineolate binds the odour molecules so they rinse out rather than sitting in the fabric, and oxygenating agents lift residue without optical brighteners, chlorine bleach or phosphates. It's a low-foam powder, so it suits standard and high-efficiency machines.
2. Wash at 30°C. Check the care labels on your kit — almost all of them say 30°C maximum. Hot water breaks down the elastane that gives your clothes their stretch and compression, and it can damage DWR coatings on waterproof layers. A good sports detergent is active from 20°C, so you don't need heat to get things clean. We've covered the temperature question in detail in can you wash gym clothes at 40 or 60 degrees?
3. Turn everything inside out. Sweat, body oils and bacteria accumulate on the inside of the fabric. Turning clothes inside out lets the detergent work directly on the dirtiest surface, and it protects printed logos and reflective details on the outside.
4. Add the detergent to the drum, not the drawer. Low-foam powders can sit in the dispenser and only partially flush through on a short cool cycle. Putting the dose straight in the drum, before the clothes, means all of it reaches the wash.
5. Don't overload the machine. This is the most common mistake. If your gym clothes are packed tight in the drum, water and detergent can't circulate. Your clothes come out looking clean, but the bacteria deep in the fibres haven't been touched. Leave roughly a hand's width of space at the top of the drum.
6. Skip the fabric softener. Always. Softener coats fibres with a silicone or wax-based layer. On cotton that feels soft; on synthetic performance fabric it blocks the pores that let moisture pass through, so your wicking top stops wicking. The coating also gives bacteria something to live in, which is why softened gym kit often smells worse rather than better. There's more on this in is fabric softener bad for gym clothes?
7. Air dry whenever possible. Tumble dryers generate heat that degrades elastane and synthetic fibres. Hanging kit to dry is gentler, and most activewear dries fast anyway thanks to the wicking. If you must use a dryer, use the lowest heat setting — and see how to dry gym clothes fast for quicker options that don't cook the fabric.
Which machine setting should you use?
Most machines have a synthetics or sports cycle, and either works. What matters is the combination: 30°C, a full-length wash rather than a 15-minute quick cycle, a moderate spin of around 800 to 1,000 rpm, and an extra rinse if your machine offers one. Quick washes are the hidden culprit behind a lot of odour complaints — they don't give enzymes long enough to do their job. Our full breakdown is in what washing machine setting for gym clothes?
Washing specific gym items
Sports bras and compression gear. These have the highest elastane content, so they're most vulnerable to heat and rough washing. Wash cool, inside out, and ideally in a mesh laundry bag so hooks and straps don't stretch or snag. See how to wash compression gear.
Merino base layers. Merino resists odour well but hates agitation and heat. Cool wash, gentle cycle, no softener, dry flat.
Waterproof and Gore-Tex shells. Wash them more often than you'd think — a dirty face fabric is what makes a jacket "wet out". Use a detergent with no brighteners or bleach so the DWR survives.
Trainers and lifting shoes. Keep these out of the machine. Wipe them down, pull the insoles out and let everything air. If they smell, our guide to cleaning smelly trainers has the full method.
Gym towels. These can take a warmer wash than your kit, but still no softener — it reduces absorbency, which defeats the point of a towel.
Frequently asked questions
How often should you wash activewear? After every session. Bacteria multiply quickly in damp fabric, and a second wear gives them a head start that makes the odour much harder to shift. If you can't wash straight away, hang the kit to dry rather than leaving it balled up in a bag. More detail in how often should you wash gym clothes.
Can you wash activewear with normal clothes? You can, but it's better not to. Towels and cotton shed lint that clings to synthetics, and jeans or zips can abrade technical fabric. A separate gym load also lets you set the right temperature and dose for the whole wash.
Does washing activewear at 30°C actually kill bacteria? Temperature alone doesn't — you'd need a wash hot enough to wreck the fabric. What removes odour is chemistry: enzymes that digest the sweat proteins bacteria feed on, plus agents that bind and rinse away the odour molecules themselves. That's why the detergent matters more than the dial.
Can you use vinegar or baking soda instead of detergent? They help a little with mild smells and neither will damage most kit, but they don't break down sweat proteins, so they won't fix set-in odour on their own.
The gear lasts longer when you treat it right
Good activewear is an investment. Washing it properly means it performs better for longer: the stretch stays, the wicking works, and it doesn't develop that permanent gym smell no amount of washing seems to fix.
Use a detergent built for the job, keep the temperature at 30°C, ditch the fabric softener and air dry. Your kit will thank you.
A 750g pouch of Titan Wash is £14.99 and gives 25 washes at the 30g dose — about 60p a wash, or 49p a wash on the 2.25kg 3-pack at £36.99. If you'd rather try it first, there's a trial sample for £2.95.