The Cosy Start Kit

The Cosy Start Kit

£100 £118 Save 15%
Designed for AN UNDERWEAR UPGRADE
the cosy start kit
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The Cosy Start Kit

£100 £118 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

£80 GBP

black
black
black
black
black
black

The Tank

£38 GBP

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

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Sleep has never looked better

Designed for multi-functional style and unmatched comfort

Twice the softness of cotton

Our pyjamas are made from a TENCEL™ Modal, derived from trees and proven to be twice the softness of cotton. Designed for a good night's sleep.

Temperature-regulating

Stay cosy without overheating. Our fabric is temperature regulating making these cosy enough for lounging but cool enough for sleeping.

Multi-functional style

Worn every night, every weekend, and maybe even a few work-from-home days, these pyjamas don’t just feel good, they look good too. Because staying cosy doesn’t have to mean sacrificing style.

OUR MISSION

Comfortable where it counts, style everywhere else.

We were tired of compromising function for style. Because comfort and style should be a given, not a compromise. At Underdays, you get both—always.

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Product details