MODEL_INFO=Model wears Size S

The Everyday Boyshort - Butter

£20

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Size guide

XS S M L XL XXL

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1
2
-15%
4
-20%

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Our Everyday Everyday Boyshort in Butter, now with HeiQ Skin Care™ technology. A clinically tested synbiotic treatment infused in the fabric that helps restore your skin's natural balance, promote a healthier skin appearance, and strengthen your skin's protective barrier. No extra steps. Just wear it.

The Everyday Boyshort is a mid-rise, extended-leg brief that provides the most coverage in the Everyday range. Made from ultra-soft modal with flat seams and an extra-long gusset. The boyshort silhouette is designed for customers who want full coverage with a relaxed, lounge-ready feel that’s still smooth enough to wear under clothes.

•Style: Mid-rise boyshort, full coverage with extended leg

• UNDERskin™: 100% biobased synbiotic technology, supports your skin's natural microbiome, lasts up to 40 washes. Data provided by HeiQ based on testing conducted on other materials.

• Rise: Mid-rise (sits just below the natural waist)

• Coverage: Full coverage front, back, and upper thigh. The mostcoverage of any Underdays style.

• VPL (Visible Panty Lines): The boyshort has a longer leg line, so the seam sits lower on the thigh than a brief. Under loose or mid weight fabrics (jeans, trousers, skirts) it’s smooth. Under tight leggings or very thin fabrics, the leg line may be visible — a thong or cheeky would be better for those outfits.

• Best For: Daily wear, lounging, sleeping, under skirts and dresses,summer wear, anyone who prefers maximum coverage

•Fabric: 92% Tencel Micromodal, 8% Elastane

• UNDERskin™: Prebiotics + probiotics infused in the fabric transfer to your skin on contact, supporting a balanced, healthy-looking microbiome. 100% biobased. Powered by HeiQ Skin Care™.

•Waistband: Wide, soft elastic, no-dig, no-roll

•Gusset: Extra-long (approx. 2cm wider than standard)

•Leg Elastic: Flat comfortable elastic for reduced VPL

•Sustainability: Our gusset 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.

•OEKO-TEX certified: All of the fabrics we use are independently certified by OEKO-TEX (SH015 210990 Testex), meaning all our underwear is free from harmful substances.

•Care: To preserve the HeiQ Skin Care™ treatment, wash at 30°C on a gentle cycle. The synbiotic technology is designed to last up to 40 home washes. Data provided by HeiQ based on testing conducted on other materials.
We also recommend to wash your Underdays in a mesh laundry bag. Air-dry flat in a shaded area. Do not bleach. Do not iron or tumble dry.

  • We offer both Next Day Delivery and Standard Delivery

Size down for a snugger fit, size up for a more relaxed fit.
Exchanges available if the size isn’t right.

View size guide
Select size
size chart

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

TENCEL™  modal antimicrobial fabric derived from trees

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

A 2cm extra-long gusset for everyday protection

Soft leg elastics designed to eliminate digging in

key benefits of our latest technology UNDERskin™

rebalance

rebalance

Helps restore the natural balance of your skin microbiome.
radiance

radiance

Promotes a healthy skin appearance thanks to pre+probiotics.
protect

protect

Strengthens your skin's natural protective barrier.
nourish

nourish

Feeds your own, native good microorganisms.
consistent

consistent

No change to handfeel, breathability, colour, or wicking.
  • 100% biobased

  • Certified biodegradable

  • Clinically tested

  • Compliant with EC Cosmetic Regulation No 1223/2009

frequently asked questions

Our Everyday Collection is treated with HeiQ Skin Care™ — Swiss synbiotic technology that supports your skin’s microbiome through fabric-to-skin contact. Underwear that works like skincare. It’s a cosmetic treatment that promotes healthy skin appearance, not a medical product, it doesn’t diagnose, treat, or prevent disease. UNDERskin™ is embedded directly into the fabric during production, so it’s working from the very first wear. No creams, sprays, or steps required.

No change to handfeel, breathability, colour, or fit, it feels exactly like the Everyday you already love. Non-irritant, human skin patch tested, and all ingredients INCI-listed.

Please check out our size guide above. We offer free exchanges on unworn items, so if the fit isn’t right you can swap for a different size hassle-free. Not feeling it at all? We accept returns within 30 days of purchase.

Both are full-coverage styles, but they cover different areas. The Everyday Brief stops at the hip crease like traditional underwear. The Boyshort extends down the upper thigh, giving you more leg coverage and a barrier between your thighs to prevent chafing. If you want classic full-coverage underwear, choose the Brief. If you want extra thigh coverage, anti-chafe protection, or a loungier feel, choose the Boyshort.

No. The longer leg line is designed to stay flat against the thigh without riding up or bunching into the hip crease. The soft leg openings keep everything in place throughout the day.

It’s one of the best styles for it. The extended coverage and ultra-soft modal make it feel like a cross between underwear and shorts. Many customers wear it as sleepwear or around the house on its own.

It’s ideal under looser skirts, midi and maxi dresses — the breathable modal keeps you cool, without the bulk of cycling shorts or anti-chafe bands. Under a fitted or bodycon dress, the leg line may be visible. For tight dresses, the Everyday Thong (zero VPL) or the Cheeky (minimal VPL) are better choices.

Fashion colours and seasonal drops are limited edition — once they sell out, they won’t be coming back. If you spot a colour you love, we’d recommend grabbing it before it’s gone. Follow us on social or sign up to our mailing list to be the first to know when new colour drops land.

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