21 Best Underwear for Working Out 2025, Approved by Ob-Gyns

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Pact Organic Cotton

“There’s a lot to love about Pact,” says Kiana Reeves, chief education officer at Foria, a sexual wellness company. First, she loves that their styles are simple and comfortable. But more importantly, these undies are made from organic cotton—a gynecologist-recommended material.

“The moment I discovered Pact, I truly started to question how I’d gone so long without this brand in my underwear drawer,” says Glamour contributor Kristine Thomason. “Not only are they so comfortable and soft to the touch, but they’re also breathable (hello, 100% organic cotton). I always find myself reaching for these undies or a Pact thong before a strength workout or hike.”

  • Sizes: S–XL
  • Materials: Organic cotton, elastane
  • Pros: Organic cotton; breathable; stays in place
  • Cons: Potential panty lines; limited size and color range
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