Smooth ordering process and quick delivery. Would shop here again.

Customer Reviews
Had a question before ordering and customer service answered within a few hours. Product is great too.
Second time ordering from Theunderdays. Consistent quality and fast shipping.
Does what it promises. Comfortable to use and well finished.
Exactly as described. Good quality and it arrived sooner than I expected.
Really happy with this purchase. The quality is better than I thought it would be for the price.
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