The best underwear for the gym (and heavy sweating)

Short answer: the best underwear for the gym is a seamless, moisture-wicking G-string with a cotton-lined gusset. It keeps you dry when you sweat, does not show under leggings, and has no back seam or leg elastic to ride, dig or chafe mid-workout. Briefs bunch and print a line, cheap thongs ride, and all-cotton turns soggy. Here is what actually matters at the gym, and how to choose.

What makes underwear good for working out?

• Moisture-wicking, not absorbing. You want a breathable knit that moves sweat and dries fast, not cotton that soaks and stays wet.
• No visible line under leggings. Gym tights are thin and unforgiving, so a seamless cut with no back seam is the only thing that truly disappears (more here).
• No ride, no dig, no chafe. Bonded flat edges instead of stitched elastic, so nothing shifts or rubs while you move.
• A cotton-lined gusset for breathability and comfort against sensitive skin.

Why a seamless G-string beats briefs for the gym

Briefs have the most fabric to bunch, print and hold sweat. A seamless G-string removes the back coverage entirely, so there is less to ride, nothing to show under leggings, and less fabric to trap moisture. Paired with a wicking knit and a cotton-lined gusset, it is the cut that genuinely disappears through a squat, a run or a reformer class.

What about heavy sweating and hot classes?

This is where wicking earns its keep. In a hot Pilates or spin class, cotton gets heavy and stays damp, while a breathable performance knit keeps moving moisture and drying. Staying dry is the difference between forgetting your underwear exists and thinking about it the whole session.

The best underwear for the gym, in short

Seamless G-string, moisture-wicking knit, cotton-lined gusset, bonded flat edges, in your size. That combination handles sweat, VPL and chafe in one pair. It is exactly what we built the Anywhere G for, and it works just as well the rest of the day, from $21.90 a pair in packs.