Our Lingerie, the ultimate summer investment.

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Our Promise

1 pair of Underdays =

✔️ 50 rounds of user-testing

✔️ Gynaecologist approved

✔️ Purposeful fabrics

✔️ Made in Europe

What they're saying about us

Introducing the Thong Starter Pack

New to Underdays? It's time to invest in feeling good–– try our thong starter pack which brings together our three bestselling styles, for less.

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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—which is more breathable and hygienic for your body.

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