The Thong Starter Kit

The Thong Starter Kit

$63.00
$63.00 $117.00
SAVE 46% Sold out

Designed with you in mind, Theunderdays offers newcomers a special way to try the brand, with your health, comfort, and style considered at every step. Inside the Starter Kit you'll find 3 thongs and a handy pouch for keeping your essentials within reach, so it's a perfect first move toward trying the label that's changing the game in underwear.

 

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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

Underdays
High Street Brand

TENCEL™  modal antimicrobial fabric derived from trees

Included
Synthetics

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

Included
Not included

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

Included
Not included

Engineered for optimal airflow and breathability

Included
Traps moisture

A 2cm extra-long gusset for everyday protection

Included
Not included

Soft leg elastics designed to eliminate digging in

Included
Harsh seams

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4.65
★★★★★
88 reviews
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Fit
SmallPerfectLoose
What customers say Auto-generated
Reviewers consistently praise The Thong Starter Kit from Underdays for its exceptionally soft, breathable fabric that provides all-day comfort without irritation or visible panty lines. They also highlight the flattering fit, durable construction that maintains its shape after washing, and the delightful color assortment.
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Avatar for Maria P Maria P ✚ ◆ Verified buyer
★★★★★

Fabulous for everyday busy lifestyle!

The replenish kit is a bundle of both everyday and high briefs. The added scuba pouch is also a bonus. The material is really nice, resembling the feel of silk. However, I felt the everyday brief is a better design fit than the full brief.The full brief does not seem to have enough cover at the back and the front slides sometimes due to the extra material. But , overall the everyday brief is a win... Read more

Fit
SmallPerfectLoose
Review for The Black Replenish Kit - Full Coverage - Full Coverage / M
♥ Would recommend
Avatar for Kristy G Kristy G ✚ ◆ Verified buyer
★★★★★

Super soft but not enough coverage

Super soft fabric and a good fit around the wait, but for a brief there wasn't enough fabric around the bottom - more like a Brazilian (so I can't imagine what a cheeky is like) and there isn't quite enough elastic to hold it in place so they rid up and gave me a wedgie all day. Probably okay when wearing trousers to keep them in place, but not a skirt. Smaller size might have been better, but lik... Read more

Fit
SmallPerfectLoose
Review for The Brief Starter Kit - Brief / M
Avatar for Emily U Emily U ✚ ◆ Verified buyer
★★★★★

Lovely comfortable underwear

Super comfy fabric, lovely styling and very flattering. Do not ride up which is excellent!

Fit
SmallPerfectLoose
Review for The Brief Starter Kit - Brief / M
♥ Would recommend
Avatar for Divya Divya - ✚ ◆ Verified buyer
★★★★★

would recommend, comfy and no digging in!

Really comfy and do not pull!

Fit
SmallPerfectLoose
Review for The Brief Starter Kit - Brief / S
♥ Would recommend
Avatar for Alex I Alex I ✚ ◆ Verified buyer
★★★★★

Big fan

Big fan - they're so soft and flattering and yet somehow still breathable. Very happy.

Fit
SmallPerfectLoose
Review for The Thong Starter Kit - Thong / M
♥ Would recommend