The Brief Starter Kit

Name: The Brief Starter Kit
Brand: Underdays
SKU: BUD-BSK-S
Price: 72 GBP
Availability: InStock

£72 £100 Save 28%

Designed for Brief-Lovers

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The Brief Starter Kit

£72 £100 Save 28%

Designed for Brief-Lovers

Size: Size Guide

Customers say fits true to size

Why we made this

Your everyday favourite, reimagined. The Brief Starter Kit includes 4 pairs of our everyday briefs—praised for their supreme softness and ultra-flattering fit—plus a denim tote bag that’s as stylish as it is functional. It’s everything you need to feel fresh, comfortable, and completely put-together in 2025.

What’s inside: 4 Everyday Briefs + 1 Denim Tote Bag

Valued at: £100

Yours for: £72

You save: £28

Details

Supreme softness: Made from a natural, cellulose fabric that’s twice as soft as cotton.
Stays fresh all day: Moisture-wicking fabric and an extra-long gusset with antimicrobial properties to keep you feeling clean and confident.
Adjusts to you: Designed with an adjustable rise and perfect shape retention, for a fit that flatters and moves with you.
Better for you: Breathable fabrics that prevent irritation and feel like a second skin.
Stay Organised: The denim tote is big enough for your laptop, with six outer pockets and a secure internal space for essentials like your phone and wallet.

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 Brief

•92% Micromodal, 8% Elastane
•Gusset: 47% Modal, 46% Cotton, 7%Spandex
•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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