Best for: everyday wear, active wear, and travel. Our award-winning Natural Fiber Bikini is designed for all-day comfort — the naturally soft, breathable modal makes it a go-to for active use, everyday wear, travel days, and warm weather when you want something soft against skin that dries quickly. Crafted from PFAS- and BPA-free, Oeko-Tex® certified plant-based fabric. Wirecutter's top pick for travel underwear for active women. Unmatched Comfort: Made with Superfine™ micro-modal, one of the finest knitted fabrics in the world, derived from sustainably harvested beech tree pulp. This fabric has 6% spandex for 4-way stretch and dries twice as fast as cotton, making it an excellent choice for low-, medium- and high-impact workouts alike. Reliable Everyday Performance: Tested by our team across Nordic and alpine skiing, marathon training and racing, racquet sports, golf, team sports and travel, and it stays in place. Moisture-Wicking and Quick-drying: Experience twice the softness of cotton with superior moisture-wicking properties. Micro-modal dries quickly and prevents moisture from saturating the fabric, helping you regulate your body temperature. Enhanced Coverage and Stability: The front panel of the bikini is double-layered for added comfort and coverage, while the wide waistband prevents rolling, ensuring the bikini stays put during any movement. Note: our natural fiber underwear runs small. Size up if you are in between sizes. For those concerned about underwear lines under leggings, we recommend trying our seamless or natural fiber thong options.