Great quality, well packaged and easy to use. No complaints.

Customer Reviews
Nice product, decent price. Shipping updates kept me informed the whole time.
It's a little smaller than I pictured, but the quality makes up for it.
Great experience with Theunderdays. Tracking worked and the package arrived in perfect condition.
Would give it 4.5 if I could. Small detail I'd change, but overall very good.
My partner keeps borrowing it, so I'm ordering a second one.
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