The Everyday Thong is made from ultra-soft modal for daily comfort — ideal under work clothes, jeans, and dresses. The Workout Thong uses a moisture-wicking performance fabric that handles sweat and movement during exercise. Same flattering thong shape, different fabric engineered for different purposes.

Yes. The Everyday Thong is Underdays’ best option for completely invisible underwear under any outfit, including white, thin, or body-hugging fabrics.

Yes — that’s exactly what it’s designed for. The modal fabric is softer than cotton and the wider waistband sits flat without cutting in. Many of our customers wear the Everyday Thong as their daily go-to, not just for special occasions or specific outfits.

For light activities like walking, gentle yoga, or Pilates, the Everyday Thong works well. For anything higher intensity — running, HIIT, hot yoga, weight training — the Workout Thong’s moisture-wicking fabric will keep you drier and more comfortable.

We’re focused on making the best underwear possible. Bralettes are currently in development— sign up to our mailing list to be the first to know when they launch.

Our core colours such as Black and Sand are always available and restocked regularly. Fashion colours and seasonal drops are limited edition — once they sell out, they won't be coming back. If you spot a colour you love, we'd recommend grabbing it before it's gone. Follow us on social or sign up to our mailing list to be the first to know when new color drops land.