11 Best Underwear for Working Out, Approved by Ob-Gyns & Trainers 2026

• What we like: Smooth fit; ultra-light; seamless
• Please note: Minimum coverage

For a truly invisible, barely-there pair of underwear, opt for this seamless pair from Alo, which UESCA-certified running coach and ISSA-certified personal trainer Liz Schmoll calls a “good seamless option for everyday use with odor control.”

“The seamless design was flat, the sides didn’t bunch up under my clothes, and it felt cool and comfortable,” said Dana Leigh Smith, Condé Nast vice president and head of health content. “There were no wrinkles, even under tight leggings. They wicked sweat very well, which made me feel comfortable during my workout.”

“They’re not kidding when they call it invisible. This thong feels really lightweight and isn’t visible under a pair of leggings,” explains Charm contributor Kristine Thomason. “These have quickly become my favorite workout underwear for Pilates classes, yoga flows, or any workout where I prefer to minimize panty lines. And uncomfortable wedges.

• Sizes: XXS–XL
• Materials: Nylon and spandex blend