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Biggest sale of the year is on

Say goodbye to distractions at the gym

Engineered to wear under gym leggings. The Workout Thong's quick-dry fabric is supremely comfortable, with functional seams that stay put, but four-way stretch that moves with you. No chafing, no riding up and minimal VPL. 

So if you have never found the right pair of workout underwear then give Underdays a try. You’ll never look back.

   10% off your first order

Say Goodbye To Neck & Chest Wrinkles In Just A Few Weeks

Discover the transformative power of our Lift Factor Neck & Chest Firming Cream. Expertly formulated to target wrinkles, sagging, and signs of aging on the neck and chest, this cream promotes skin regeneration, elasticity, and deep hydration. With its luxurious texture that's quickly absorbed, you'll experience an immediate firming effect. Day by day, unveil a more sculpted, youthful neck and décolleté. Elevate your beauty. Redefined.

Over 50+ Rounds of User-testing to create the Perfect Workout Thong

Minimal VPL

Underwear with minimal VPL under leggings.

Sweat-wicking technology

Use of sweat-wicking antimicrobial fabric to keep you fresh & dry– preventing yeast infections. 


Extra stretch to move with your body but also stays in place— no more digging in or riding up anywhere.

Contrast stitching

Functional yet also stylish.


Tighten and lift the sagging skin on your neck, restoring a more defined and youthful contour.


Reduce the appearance of fine lines and wrinkles on the chest, revealing smoother, rejuvenated skin.




Combat the appearance of horizontal lines across the neck.

Our Experts Recommended Solutions

🚨 Stock is limited 1853pcs left 🚨

Most popular

90 days money back guarantee

Clinically proven ingredients

Suitable for sensitive skin

Clinically proven ingredients

Clinically Proven Ingredients

Our skincare solutions are developed from the ground up, with scientifically proven active ingredients and the expertise of the best laboratories in the world. Our commitment to meticulous research and development ensures us to bring you innovative and safe products that enhance your natural beauty.

Hear it from them

Claire M ⭐⭐⭐⭐⭐

Perfect for under running shorts 

This is such a great thong under my running shorts. I wear tight fitting hot pants style shorts for running but prefer knickers under them as well. This Underdays thong is perfect, I've now bought 3 and am waiting for more stock to buy a 4th pair. Wash really well, super comfy. 

Kari Ann S ⭐⭐⭐⭐⭐

The best 👌

These are the best underwear I've worn. The material is so soft, the styles are really flattering and they are so comfy. Since finding this brand a year ago I haven't worn anything else! The knickers are also good quality and do not ruin or pull in the wash. So worth the money!

Helen H ⭐⭐⭐⭐⭐


As someone who hates things and would never wear them this is a winner. I only tried these after enjoying the brief styles and wanting something to wear under my leggings that wouldn't show VPL. I usually go for seamless shorty styles but they are thin materials and don't last. I don't even feel like I'm wearing a thong, or anything with these. So comfortable. 

Hear it From Them

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