The Cosy Start Kit

The Cosy Start Kit

$204.00 $241.00 Save 15%
Designed for AN UNDERWEAR UPGRADE
the cosy start kit
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The Cosy Start Kit

$204.00 $241.00 Save 15%
Designed for AN UNDERWEAR UPGRADE
Size Guide
Customers say fits true to size

Free UK Delivery over £60+

Free UK Returns & Exchanges

Complete the look
the pyjama set
the pyjama set
the pyjama set
the pyjama set
the pyjama set
the pyjama set

The Pyjama Set

$164 AUD

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The Tank

$51 AUD

This winter, invest in the cosy items you’ll live in (and never want to take off). Which is why we designed The Cosy Start Kit: comforting, soft, and exactly what you deserve. Perfect for hibernating, lounging, and everything in between. Featuring Underdays Pyjamas (so soft you’ll want to live in them), our ultra-comfortable everyday thong, and a denim tote bag you’ll use daily for your essentials. It’s the purposeful, feel-good set you need to survive the winter months.

Details

  • Supreme softness: Pyjamas crafted from buttery, breathable fabric that hugs you just right.
  • Unrivalled comfort: Designed to feel good against your skin and keep you cosy through morning and night.
  • Barely there:  A thong so soft and breathable, you’ll forget you’re wearing it—perfect under anything.

Stay organised: A denim tote that works overtime, from errands to the gym, with six outer pockets and a secure spot for your essentials.

Fabric and Care

Tote
90% Cotton, 10% Viscose

Disclaimer:
The fabric used in the tote bag has been dyed using indigo dye. Please take care with lighter fabrics as colour may transfer. To minimise the risk of colour transfer you may machine wash separately on a cold setting and air dry flat. Do not tumble dry.

Everyday Thong
•92% Micromodal, 8% Elastane
•Gusset: 47% Modal, 46% Cotton, 7%Spandex
•OEKO-TEX certified

Pyjamas
•93% Tencel Modal/ 7% elastane

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

High Street Brand

TENCEL™  modal antimicrobial fabric derived from trees

Synthetic fabrics

Approved by intimate health experts

12 hours of freshness and breathability

Traps moisture

A gusset 2cm longer than industry average

Soft leg elastics designed to eliminate digging in

Harsh seams
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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Revolutionary underwear Underdays + You Underdays + You Underdays + You Underdays + You