The Underdays Starter Kit - Mix

The Starter Kit

$105.00

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Mix

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Meet the Underdays Starter Kit — your perfect introduction to the UK’s cult-favourite underwear brand. Designed to help you start fresh and feel what healthy underwear really feels like. Each set includes three bestsellers — the Workout Thong in Olive, the brazilian-cut Cheeky in Black, and the Full Brief in Grey — thoughtfully made to support your body from morning movement to busy days. Finished with our sleek Scuba Cloud Pouch, it’s everything you need to build your first intentional underwear drawer.

  • The Everyday Collection is crafted from buttery-soft, breathable fabrics — designed for comfort on busy days.

  • The Workout Thong is known for its sweat-wicking, quick-drying performance that keeps you fresh through every workout (and everything in between).

  • An antimicrobial gusset supports intimate health — from daily wear to days in motion.

  • Flatters every fit and holds its shape wear after wear.

  • Comes in our Scuba Cloud Pouch — your sleek, on-the-go essential for gym, work, or weekend trips.

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

Workout Thong
•80% Recycled Nylon, 20% Elastane Lycra
•Gusset: 47% Modal, 46% Cotton, 7% Spandex
•All fabrics are OEKO-TEX certified (HK020 196895 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

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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

High Street Brand

TENCEL™  modal antimicrobial fabric derived from trees

Synthetic fabrics

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

Engineered for optimal airflow and breathability

Traps moisture

A 2cm extra-long gusset for everyday protection

Soft leg elastics designed to eliminate digging in

Harsh seams

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