Buy less, wear better.

Your new necessity

Investment-quality underwear designed for comfort, health, and longevity.
Meet the Underdays Starter Kit
Comfort First

Comfort First

Breathable, weightless fabrics that feel calm on skin from morning to night.

Skin-Kind by Design

Skin-Kind by Design

Thoughtfully chosen fibres that support everyday skin comfort.

Made to Last

Made to Last

Investment-quality underwear that holds its softness wash after wash.
INSIDE THE SET

A Better Foundation

Each set includes 3 pairs of breathable, pH-balanced TENCEL™ Modal underwear — designed to support your everyday routine. Plus our Scuba Cloud Pouch to keep your favourites close. 

Exclusive £55 Starter Price (£33 off)
The Thong Starter Kit

The Underdays Starter Kit

£48

Style :

Thong Brief Mix

Size :

Size guide

XS S M L XL XXL

Product fit

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What makes us different

Designed to feel like a second skin.

Proudly apart from others.

What makes us different

Designed to feel like a second skin.

Proudly apart from others.

Underdays
Others

TENCEL™

modal antimicrobial fabric derived from trees

Tested by real women

with over a 1,000 five-star reviews

Breathability

engineered for optimal airflow

Everyday protection

a 2cm extra-long gusset

Soft leg elastic

designed to eliminate digging in