mix

The Underdays Starter Kit

£45

Style :

Mix Thong Brief

Size :

Size guide

XS S M L XL XXL

Product fit

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Your everyday underwear, levelled up.

3 pairs from our breathable, best-selling collection—made to move with you, stay fresh, and feel good all week. Comes with our signature puffer pouch for storing your essentials.

Buttery-soft, breathable fabric

Sweat-wicking, antimicrobial gusset

Flatters every fit, holds its shape

Adjustable rise for all-day comfort

The stylish puffer pouch makes it easy to take your new favourites anywhere—gym, work, or weekend trips


•92% Micromodal, 8% Elastane
•Gusset: 47% Modal, 46% Cotton, 7%Spandex
•All fabrics are OEKO-TEX certified (SH015 210990 Testex)

Finally—underwear that wins 5* reviews for washing well and holding its shape. No more holes, this style was built to last.
•Cool wash, 40° max.
•Air-dry flat in a shaded area
•Do not iron or tumble dry
•Wash in garment bag

  • We offer both Next Day Delivery and Standard Delivery

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Your underwear deserves better

You care about your skin, your wellness, your rituals. We’re pioneering care for your most intimate parts.

Twice the softness of cotton

Our underwear is made from TENCEL™ Modal—sustainably derived from trees and twice as soft as cotton. Gentle on the skin and made to feel like nothing at all.

Let your ____ breathe freely

TENCEL™ fibers are unfavorable for bacteria growth. They wick away moisture and keep you fresh through the day. Designed to help reduce the risk of unwanted infections.

OEKO-TEX Certified

OEKO-TEX® certified —clean, non-toxic with no harmful substances

Set apart by design

TENCEL™  modal antimicrobial fabric derived from trees

Tested by real women, with over 1,000 five-star reviews

Engineered for optimal airflow and breathability

A 2cm extra-long gusset for everyday protection

Soft leg elastics designed to eliminate digging in

Product details