Free tote with every order—ends soon!


Our Promise

1 pair of Underdays =

✔️ 50 rounds of user-testing

✔️ Designed with a gynaecologist

✔️ Solutions-driven fabrics

✔️ Made in Europe

What they're saying about us

Introducing the Brief Starter Pack

New to Underdays? It's time to invest in feeling good–– try our Brief Starter Pack which brings together our three bestselling styles for less.

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Three collections designed to target your biggest pain points

We're changing the gusset game

Your gusset is that internal lining in your underwear that gets up close and personal with your most intimate parts. For too long, gussets have been too short and not given you enough coverage. At Underdays, we worked with a gynaecologist to change the gusset game. We added length and swapped cotton for bamboo—a more breathable and hygienic fabric for your body.

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Refer your friends & get a free pair of Underdays

Make them feel just as good as you do—give your friends 10% off and you'll get a free pair of Underdays when they shop with your link.

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