Best for: running, training, and high-intensity workouts. Our best-selling Seamless Bikini is built to keep up with running and training days, with fast moisture-wicking and quick dry time so it doesn't hold you back mid-workout. Certified BPA- and PFAS-free. Combines high-quality materials with innovative features for maximum comfort and durability. Superior Comfort: H igh-quality soft elastic at the leg openings prevents bunching or chafing during movement. Performance-Driven Design: Made from super-soft, micro denier recycled nylon and spandex yarns for 4-way stretch. Wicks moisture and dries quickly, keeping you cool and dry through a run or training session. Innovative Construction: Our Seamless Bikini is BPA-free and PFAS-free and features no side seams and no annoying tags. Stay-in-Place Promise: With our stay-in-place promise, you'll never have to worry about adjusting your underwear throughout the day. Note: For those concerned about underwear lines under leggings, we recommend trying our thong!