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

• What we love: Smooth fit; ultra-lightweight; seamless
• Worth noting: Minimal coverage

For a truly no-show, barely there pair of underwear, go 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 wear with odor control.”

“The seamless design sat flat, the sides didn’t twist under my clothing, and it felt cool and comfortable,” says Condé Nast vice president and health content lead Dana Leigh Smith. “There was no bunching, even under tight-fitting leggings. They were very sweat-wicking, which kept me feeling comfy during my weight-training session.”

“They aren’t kidding when they call it invisible. This thong feels truly weightless and isn’t remotely visible under a pair of leggings,” says Glamour contributor Kristine Thomason. “These quickly became my go-to workout underwear for Pilates classes, yoga flows, or any other workouts where I’d prefer to minimize panty lines and uncomfortable wedgies.”

• Sizes: XXS–XL
• Materials: Blend of nylon and elastane