The Underdays Starter Kit

The Underdays Starter Kit

£45 £78 Save 42%
Designed for AN UNDERWEAR UPGRADE

The Underdays Starter Kit

£45 £78 Save 42%
Designed for AN UNDERWEAR UPGRADE
Multi
Size Guide
Customers say fits true to size

Free UK Delivery over £60+

Free UK Returns & Exchanges

Your Exclusive Invite: The Underdays Starter Kit

This one’s for you—a first-timer’s exclusive to experience Underdays. Designed for your health, comfort, and style, the kit includes 1 brief, 1 thong, 1 cheeky, and a sleek puffer pouch to carry your essentials. The Underdays Starter Kit is here to redefine what underwear should feel like: soft, supportive, and kind to your body. Exclusive. Limited. And exactly what you deserve.

What’s inside: 1 Brief + 1 Thong + 1 Cheeky+ 1 Puffer Pouch

Valued at: £78 

Yours for: £45

You save: £33

Details

  • Good for your body: Made from breathable, natural fabrics that wick away sweat, prevent irritation, and promote healthier skin.
  • Soft + supportive: Underdays underwear is twice as soft as cotton with an antimicrobial gusset for all-day freshness.
  • The perfect fit: Designed with an adjustable rise and shape-retaining stretch for ultimate comfort and flattering angles.
  • Carry your Essentials: The stylish puffer pouch makes it easy to take your new favorites anywhere—gym, work, or weekend trips.


Fabric and Care

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

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

Shipping and Returns

  • We offer both Next Day Delivery and Standard Delivery

Sizing

Not sure?

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Goodbye Discomfort.

No more digging in, riding up, or chafing.

Twice the softness of cotton

Our underwear is made from a TENCEL™ Modal, derived from trees and proven to be twice the softness of cotton. Designed to feel like a second skin.

Let your ____ breathe freely

TENCEL™ fibers are unfavorable for bacteria growth. They wick away moisture and keep you fresh through the day.

Ultimate comfort without the holes

Unlike traditional cotton, TENCEL™ Modal fabric is durable, tough and has a longer lifespan than its alternatives. Say goodbye to underwear that only lasts a few washes.

Ultimate Protection

Our gusset (the piece of fabric that keeps you covered) is 2cm longer than industry average and antimicrobial.

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Unrivalled Style

Say goodbye to conventional cuts or unflattering fits. We were tired of compromising comfort for style. Our design ethos is unparalleled comfort, unrivalled style.

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There is no competition

TENCEL™  modal antimicrobial fabric derived from trees

Approved by intimate health experts

12 hours of freshness and breathability

A gusset 2cm longer than industry average

Soft leg elastics designed to eliminate digging in

OUR MISSION

Everyday essentials, reimagined.

Crafted with care, backed by science, and perfected through 50+ rounds of testing with female health experts. We're turning underwear into self-care.

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Product details

Revolutionary underwear Underdays + You Underdays + You Underdays + You Underdays + You