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American Focus > Blog > Tech and Science > How Often You Should Wash Your Exercise Clothes, According to Science : ScienceAlert
Tech and Science

How Often You Should Wash Your Exercise Clothes, According to Science : ScienceAlert

Last updated: March 23, 2025 2:38 am
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How Often You Should Wash Your Exercise Clothes, According to Science : ScienceAlert
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Are you guilty of tossing your sweaty gym clothes into the washing machine after every workout, or do you give them a second or even third wear before laundering them? The debate on how often to wash your sports clothes has been fueled by the French government’s recommendation to wear them up to three times before washing, citing environmental concerns.

While frequent washing can contribute to textile waste and consume significant amounts of water and energy, the question remains: is it safe to rewear gym clothes from a health perspective?

Man jogging in forest in sweaty clothes
When clothing is damp, including from sweat, bacteria multiply much faster. (Shashank Shekhar/Unsplash)

Sports Clothes and Sweat

Modern exercise clothing is predominantly made of high-performance synthetic fabrics designed to manage moisture, regulate temperature, and control odor. However, research has shown that these fabrics, especially synthetics like polyester, can harbor significant amounts of bacteria after just one use. The warm, humid micro-environments created by moisture in these fabrics provide ideal conditions for bacteria to multiply rapidly.

Despite this, innovations in textiles such as silver nanoparticles, essential oil-based treatments, and long-lasting antimicrobial treatments are making garments more durable and better at controlling bacteria.

Is It Safe to Rewear Gym Clothes?

The safety of reusing gym clothes depends on several factors:

Fabric Type: Natural fibers like cotton harbor fewer odor-causing bacteria than synthetics, making them suitable for multiple wears. However, synthetic fabrics may require more frequent washing due to bacterial proliferation.

Exercise Intensity and Sweat Level: High-intensity workouts that generate more sweat may necessitate washing clothes after every use, while low-intensity activities like yoga or walking may allow for multiple wears.

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Season: Climate conditions such as temperature and humidity can influence bacterial growth on fabrics. Cooler months with less sweat production may require less frequent washing.

Personal Health: Individuals with skin conditions, compromised immune systems, or prone to skin infections should exercise caution when reusing gym clothes.

While cotton garments worn for light activities may be reworn once or twice if properly aired out, synthetic performance wear or clothes worn during intense workouts should be washed after each use, especially those in contact with high-bacteria areas.

Woman hanging from bouldering wall in chalk dusted clothes
Clothes should always be washed after intense exercise. (Yns Plt/Unsplash)

Tips for Clothes Between Wears:

  1. Turn garments inside out and hang them up immediately after exercise to expose bacteria to the air.
  2. Ensure items are completely dry before storing.
  3. Store in well-ventilated areas, avoiding closed containers like washing hampers.
  4. Hang clothes in the sun for natural antimicrobial benefits.
  5. Keep worn items separate from clean clothes.

The Bottom Line

Ultimately, the decision to rewear gym clothes depends on personal factors such as environmental concerns, health considerations, and exercise habits. While some items like sports bras, underwear, and heavily soiled or smelly clothing should always be washed after each use, lighter activities and fabric types may allow for multiple wears.

Carolina Quintero Rodriguez, Senior Lecturer and Program Manager, Bachelor of Fashion (Enterprise) program, RMIT University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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