healthy underwear is the new skincare

You spend more on your serum than your underwear. One sits on your skin for 30 seconds. The other, 12 hours. Most underwear is petroleum-based polyester. Underdays is plant-based, pH-balanced, no polyester.
see what's different
  • Tree-derived, not petroleum-based

  • Extra-long gusset for all-day freshness

  • Antimicrobial protection

  • Gynaecologist-designed

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-15%
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-20%
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Made for your most delicate skin

Made for your most delicate skin

The skin down there is up to 10x more permeable. Our TENCEL Modal comes from trees, not the petroleum-based synthetics in most underwear.

Freshness that lasts all day

Freshness that lasts all day

An extra-long antimicrobial gusset keeps you dry, protected and comfortable from morning to night. Breathable, reliable coverage that keeps distractions at bay.

Built with a gynaecologist

Built with a gynaecologist

Designed to support your intimate skin's natural pH balance. Every detail — from fibre choice to fit — was developed alongside a practising gynaecologist.