The next time you reach into your closet to pull out your favorite garment, pause for a moment. That item might be stylish, but it may not be good for your health. Here are three items that can hurt your health.

Workout shirts:

For an odor-free workout, pay attention to the material your shirt’s made out of.

Researchers at Belgium’s University of Ghent discovered that polyester t-shirts carry high amounts of bacteria. The scientists studied a group of volunteers during a spinning class. The volunteers wore cotton and polyester shirts at separate times.

Polyester shirts had the foulest smell, according to the study reported in the journal of Applied and Environmental Microbiology.

Only one type of bacteria was found on the cotton shirts: Staphylococcus. However, researchers found both Staphylococcus and Micrococcus bacteria on the polyester shirts.

This combination of bacteria is the reason for the bad odor. The combination creates odors by thriving in warm areas, like the human armpit, and destroying sweat compounds.

Skinny jeans:

Skinny jeans are another type of clothing that have a reputation for causing potential health woes. This trend can cause problems such as bladder issues, low sperm count, fungal infections, joint pain and nerve damage.

Meralgia Paresthetica, a type of nerve damage, is caused when jeans put too much pressure on the groin. The damage leads to pain that can last for several months.

Flip-flops:

With the weather heating up, watch out for flip-flops, which can leave your feet in pain this season. The footwear can cause overuse injuries and Plantar Fasciitis, which results from the lack of arch support. It leads to inflammation and pain across the bottom of the foot from the heel to the toes, according to the Mayo Clinic.

The shoe can also make you more prone to infections. A study by the University of Miami and the “Today Show” found that one flip-flop can contain more than 18,000 bacteria. The Staphylococcus Aureus bacteria, known for causing staph infections, was also present. Experts suggest not wearing flip-flops if you have an open wound to avoid infection, according to the “Today Show.”

So next time you reach into your closet, be mindful of how your clothes can affect your health.