If you’ve ever bought a pair of leggings that promise to be water-resistant, sweat-proof, or stain-repellent, you might have unknowingly bought into the world of PFAS—per- and polyfluoroalkyl substances. These chemicals, often called "forever chemicals" due to their resistance to breaking down, are used in various fabrics to make them more durable and resistant to moisture.

Sounds great, right? Well, not exactly. PFAS have been linked to a host of health concerns, including hormone disruption, immune system impairment, and even cancer. Even more alarming is the fact that some studies suggest these chemicals can be absorbed through the skin, especially when we’re sweating during a workout.

Do Lululemon Leggings Contain PFAS? (The 2025 Update)

If you’re a Lululemon fan, you might be wondering if your favourite leggings are part of the problem. Back in 2022, a study conducted by Mamavation and Environmental Health News found that some Lululemon leggings contained detectable levels of PFAS. This sparked significant concern, especially among consumers who wear these leggings directly against their skin without any barriers (like underwear).

But here’s the good news: In 2025, Lululemon officially announced that all of its activewear is now PFAS-free. After committing to phase out these chemicals by the end of 2024, the brand has finally made good on its promise. So, if you’re buying new Lululemon gear this year, you can breathe a little easier (literally and figuratively).

However, it’s worth noting that older stock or resale items may still contain PFAS, so if you’re buying secondhand, keep that in mind.

Is Going Commando in Your Leggings Safe?

Many women choose to wear leggings without underwear for comfort. But could this increase your risk if the fabric contains PFAS? The answer is: potentially. Wearing leggings without a barrier can enhance direct skin contact, which might increase dermal absorption of these chemicals, especially during sweaty workouts.

To play it safe, if you’re uncertain about the chemical content of your activewear, consider adding a thin layer of cotton between your skin and the fabric. This can act as a simple yet effective barrier.

Safer Alternatives: Brands That Are Ahead of the Game

If you’re looking to ditch PFAS entirely, here are some top activewear brands that are committed to non-toxic and sustainable practices:

• Pact: GOTS-certified organic cotton leggings that are Fair Trade and PFAS-free. Soft, breathable, and safe for daily wear.

• MATE the Label: Their MOVE collection uses organic cotton and non-toxic dyes. Produced ethically in Los Angeles, these pieces are made to move with you—without harmful chemicals.

• Happy Earth: Known for their organic cotton leggings produced in Fair Trade-certified factories. Comfortable, sustainable, and free from nasty chemicals.

• Patagonia: As of 2025, 96% of Patagonia’s fabrics are PFAS-free, and the brand is on track to eliminate the rest by next year.

• Columbia Sportswear: Their Omni-Tech Eco line now features recycled materials and a PFAS-free water repellent, making it a great option for outdoor enthusiasts.