
Model wears Size M
Model wears Size S
Model wears Size S
Model wears Size S
The Black Replenish Kit - Full Coverage
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Restock your daily basics with this set: three Black Briefs, two Black High Waisted styles, and our Scuba Cloud Pouch. Crafted from our signature TENCEL™ Modal blend, with extra stretch and an adjustable fit, this 5-pack has your whole week taken care of.
Restock your daily basics with this set: three Black Briefs, two Black High Waisted styles, and our Scuba Cloud Pouch. Crafted from our signature TENCEL™ Modal blend, with extra stretch and an adjustable fit, this 5-pack has your whole week taken care of.
92% Tencel Micromodal, 8% Elastane
Gusset: 92% Tencel Micromodal / HCN.12854
UK: free over £65. Standard 2–3 working days.
International: Please check our FAQs.
View size guide
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
Customer reviews
Reviewers rave about the Underdays Black Replenish Kit for its incredibly soft, breathable fabric that feels like a second skin and is gentle enough for sensitive skin conditions. They also praise the superb fit, flattering cut that prevents riding up or visible panty lines, and the luxurious quality of the materials which wash well while maintaining their shape.
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...
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...
Lovely comfortable underwear
Super comfy fabric, lovely styling and very flattering. Do not ride up which is excellent!
would recommend, comfy and no digging in!
Really comfy and do not pull!
Big fan
Big fan - they're so soft and flattering and yet somehow still breathable. Very happy.