The Brief Starter Kit

The Underdays Starter Kit

£48

Style :

Brief Mix Thong

Size :

Size guide

XS S M L XL XXL

Product fit

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Free UK Delivery over £60+
Free UK Returns & Exchanges

Complete the set

The easiest way to discover your new favourites. Featuring three of our bestselling Everyday styles and our exclusive Scuba Cloud Pouch, the Starter Kit is designed to take the guesswork out of building a better underwear drawer. Each piece is crafted from ultra-soft TENCEL™ Micromodal and finished with UNDERskin™ technology, our skincare-infused fabric innovation.

•Three bestselling Everyday styles

•Exclusive Scuba Cloud Pouch

•Ultra-soft TENCEL™ Micromodal

•UNDERskin™ technology

•Breathable, all-day comfort

•Extra-long gusset

•Adjustable fit

•Holds its shape wash after wash

•Designed for every day

• 92% TENCEL™ Micromodal, 8% Elastane
• UNDERskin™: Prebiotics + probiotics infused into the fabric to support your skin's natural microbiome. Powered by HeiQ Skin Care™. Lasts up to 40 washes.
• OEKO-TEX® certified

Made to last, wash after wash.

• Cool wash, 40°C max
• Air-dry flat in a shaded area
• Do not iron or tumble dry

  • 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.

Powered by UNDERskin™

Prebiotics and probiotics, infused into the fabric, transferring to your skin all day. Supports your microbiome. Strengthens your skin barrier. Promotes a healthier appearance. 100% biobased. Developed in Switzerland.

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

Synthetics

Prebiotics + probiotics infused in the fabric for a healthier skin microbiome

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

Product details