Why Gym Clothes Smell, And What Fabric Reduces Odor

You wash your gym clothes. You dry them properly. Yet, once you begin to sweat again, that smell is back. Is this sounding too familiar? Well, you are not alone. There is actual science to back up this phenomenon.

The Real Reason Your Workout Gear Smells

Here's the thing: sweat on its own doesn't smell. What smells are the bacteria that are present on your skin and inside your clothes? When you sweat, that bacteria acts on the sweat and oil, and that's what causes the smell.

Of course, things only get worse from there. The bacteria and their associated odor can get trapped inside your clothes' fibers. For synthetic materials like Polyester, this can be especially true. Washing and re-washing your clothes won't necessarily get them out. The smell will keep coming back.

This is what's known as "fabric odor," and it's one of the most irritating aspects of wearing athletic wear. The best part? Once you know what's causing it, you can start to fix it.

Why Synthetic Fabrics Are the Worst Offenders

Most gym clothing is made of synthetic fabrics, often Polyester, nylon, and spandex. These fabrics are good for stretch and moisture-wicking, but the bad news is that these fabrics love bacteria.

The fabrics are hydrophobic, meaning that they repel water. This is great in theory because water and bacteria are repelled from the skin. However, in practice, bacteria and other substances are trapped in the fabric's structure and are not rinsed away with the water.

The reasons why fabric smells so badly are as follows:

• The bacteria tend to bond well to hydrophobic fabrics.

• The bacteria are not killed by either hot or cold water.

• The tighter the fabric weave, the less water can penetrate.

• Using fabric softeners can also make the smell worse.

A. The Role of Moisture in Fabric Smells

Leaving your sweaty gym clothes in your gym bag for hours is like giving bacteria a fertile environment to thrive. The longer the bacteria are left in the gym bag, the stronger the smell will be. This is one of the best ways to ruin the smell of your fabrics.

How to Get Sweat Smell Out of Clothes (That Actually Works)

If you are dealing with persistent odors, you may not get results even after washing. Here are some tested ways for removing smells from clothing effectively:

A. White Vinegar Soak

Mix 1/2 cup of white vinegar and cold water. Then, soak your gym clothes for 30 minutes before washing. Vinegar is acidic and helps to dissolve odor-causing substances effectively. Vinegar is one of the simplest ways on how to get sweat odor out of clothes without using harmful chemicals. 

B. Baking Soda Boost

Sprinkle baking soda on smelly clothes and then wash them. Baking soda helps to eliminate acidic odor-causing substances effectively. Baking soda is one of the best ways for removing odor from fabric without damaging it.

C. Use a Sport-Specific Detergent

Regular detergents are not designed for use on sportswear. Sport detergents contain enzymes that break down proteins and fatty acids in sweat. If you are having trouble figuring out how to get sweat smell out of clothes that keep coming back, changing detergents is the answer.

D. Air Dry Outdoors When Possible

UV rays from the sun are naturally antibacterial. Hanging your gym clothes on a clothesline kills any lingering bacteria and dries out any remaining smell. Tumble dryers trap the smell from synthetic materials if they weren't rinsed out in the wash.

What Fabric Reduces Odor Best?

The best way to eliminate gym clothes odor is not only about how you wash them, but also about what they are made of to begin with. 

A. Merino Wool

The best fabric for gym clothes is Merino Wool. Merino Wool is the gold standard for gym clothes when it comes to resisting odor. It is naturally antimicrobial, meaning germs cannot survive on it. This fabric absorbs sweat differently from other fabrics, as it absorbs sweat without retaining odor. If you wear a Merino Wool T-shirt to multiple gym sessions, it will not smell bad. 

The only disadvantage of Merino Wool is its high price and lack of stretch. But when it comes to removing odor from fabric at the source, it wins the race. 

B. Bamboo Fabric 

These fabrics, such as bamboo viscose or bamboo lyocell, contain a bio-agent called "bamboo kun," which is effective at controlling bacterial growth. These fabrics are soft, breathable, and much easier on the skin than synthetic fabrics. These fabrics are great for low- to moderate-intensity activities.

C. Copper-Infused or Silver-Treated Fabrics

Some activewear fabrics incorporate copper or silver ions. These two elements have antibacterial properties that prevent odor buildup during use. These elements can be combined with synthetic fabrics to maintain moisture-wicking properties while controlling fabric smells.

D. Treated Polyester 

Not all Polyesters are created equal. Some high-performance fabrics now use an antimicrobial treatment to control odor buildup. While this doesn't eliminate fabric odor, it significantly extends the time before bacteria begin to build up in these fabrics.

Quick Fabric Comparison

Tips to Keep Gym Clothes Smelling Fresh Longer

• Wash gym clothes inside out, as bacteria accumulate on the inside.

• Wash gym clothes as soon as possible to avoid sweaty clothes sitting.

• Avoid using fabric softener, as this can seal in odors

• Do not overload the washing machine, allowing clothes to be rinsed

• Wash gym clothes in cold water, as hot water can seal in odors and damage fabric

• Store gym clothes in a laundry bag, not a plastic bag

Conclusion

The reason gym clothes smell is bacteria. The fabric you choose for your workout gear has a huge impact on how quickly bacteria can cause odor. Synthetic fabrics like Polyester can harbor bacteria, while other fabrics like merino wool, bamboo, and copper-infused materials help fight bacteria.

If you want to cut down on the time spent fighting fabric smells, consider using the right washing techniques, vinegar, sport-washing detergents, and air drying. Still, if you are ready to upgrade your workout gear, Chkokko has a good selection of gym clothes to choose from, which can help you perform at your best.

FAQs

Q1: Why do my gym clothes still smell after washing?

Standard detergents do not always penetrate synthetic fibers to eliminate bacteria. Try soaking in white vinegar before washing in a sport-specific enzyme-based detergent. Always wash sportswear inside out. Avoid using fabric softener for sportswear. 

Q2: What is the best fabric for gym clothes that don't smell?

Merino wool is the best natural choice for its ability to fight odor. It is antimicrobial and breathable. The second-best natural choice for fighting odor is bamboo. When it comes to synthetic sportswear, copper-infused and silver-coated sportswear are the best. Bacteria do not grow in copper and silver. 

Q3: Why don't my gym leggings smell fresh even after multiple washes?

Tight-weave synthetic fabrics are common in sportswear, such as leggings. It is difficult to wash away bacteria that have accumulated deep in the weave. Try soaking in white vinegar for 30 minutes before washing in a sport-specific detergent. Avoid using a dryer.

Q4: Does fabric softener help remove odor from gym clothes?

No, fabric softener makes odor worse in activewear. Fabric softener works by coating the fabric with a waxy substance that holds bacteria and prevents moisture management. Your problem is removing odor from fabric; then using fabric softener is not the solution at all. And instead, opt for a sports detergent or vinegar.

Q5: How long should I soak gym clothes to remove sweat odor?

Soaking for 30 minutes in cold water and 1/2 cup of white vinegar is usually sufficient to remove most odors. For stronger fabric smells, you may soak for 60 minutes.