Redefining Underwear Through Wellness
WHERE IT BEGAN:
With everything underwear was getting wrong
Most underwear is synthetic. It traps heat and moisture against the most sensitive skin on your body, and it's designed for how it looks on a hanger rather than how it feels at 6pm.
WHAT WE MAKE
Underwear that doesn't compromise
Breathable fabrics, chosen for how they feel after ten hours. An extra-long gusset as standard. No digging in, no riding up, no VPL. Every fabric OEKO-TEX® certified and free from anything harmful.
OUR MISSION
The layer you think about least
We're woman-led and built with our community. We obsess over fit and fabric so you don't have to think about what you're wearing underneath — on the days that matter and the days that don't.
Underwear as ritual. Never an afterthought.
Meet Our Brand Ambassador, Dr Brooke Vandermolen
Senior NHS OBGYN registrar, author of Bloody Powerful and founder of @theobgynmum, Brooke has spent over a decade caring for women from first periods to menopause.
As our Brand Ambassador, Brooke brings that clinical perspective to everything we do, helping us build products, and conversations, that reflect how the female body really works.
"I'm selective about the brands I align with. In my work as an OBGYN, I see every day how individual our bodies are and how much they can change through different stages of life. Underdays is built on the idea that we should expect better: better products, better standards, and a brand that genuinely understands the female body. That's rare, and it's exactly why I'm so proud to be part of it."
Meet the Starter Kits
FAQs