Works great. The instructions were clear and setup took a couple of minutes.

Customer Reviews
I was skeptical at first but it turned out to be a really good buy.
My partner keeps borrowing it, so I'm ordering a second one.
Second time ordering from Theunderdays. Consistent quality and fast shipping.
Great experience with Theunderdays. Tracking worked and the package arrived in perfect condition.
Honestly didn't expect much, but I use it every day now.
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