MENS SIGNATURE BOXER BRIEF
Feels Different. Because It Is.
- Superfine 50s grade bamboo — softer, cooler, finer than standard
- AirGrid™ rear ventilation — airflow where it actually builds up
- SmoothBack waistband — soft lining, no logo dig, all day
- RunFree™ panels — silky inner thigh protection for anti-chafe comfort
MENS SIGNATURE BOXER BRIEF
60 days
Money back guarantee
Don't love them?
We'll refund you.
Free shipping
On every order
Your favourites, delivered.
No minimum spend.
Fabric
Spun from a superfine 50s grade bamboo, a finer yarn thread than most bamboo underwear on the market. You will feel the difference.
Composition: 95% Bamboo Viscose, 5% Elastane
Certified to OEKO-TEX® STANDARD 100 — tested and verified free from harmful substances.
Size & Fit
Our boxer briefs run true to size. If you're between sizes, or prefer a looser fit, size up — the bamboo fabric has a natural stretch that moulds to you within a wear or two.
Care Instructions
- Machine Wash Cold
- Tumble Dry Low
- Do Not Dry Clean
- Do Not Bleach
- Do Not Iron
- • Wash With Like Colors
Every detail. Earned.
Built for the man who expects more from what he wears every day.
AirGrid™ rear ventilation
A unique woven rear panel engineered to move heat away from your body. Not decorative mesh — real airflow, built into the exact place you need it most.
RunFree™ Panels
Ultra-smooth performance panels between the thighs create a frictionless layer against your skin — so chafe never gets a chance. Run longer, move freer, feel nothing but comfort.
SculptPouch™
3D contoured, not just cut from flat fabric. Invisible flatseams on every edge. A sculpted inner boundary so nothing slips, sticks, or moves out of place.
Superfine 50s Grade Bamboo
So soft you’ll check the label. We use a finer yarn grade than most brands bother with — cooler to touch, smoother against skin, and moisture-wicking where it counts. Noticeably better from the very first wear.
AthleteLock Stitch
Reinforced at every high-stress point — seams and leg openings built to take it. Stays flat against skin, moves without pulling, and won’t unravel under pressure.
SmoothBack™ Waistband
The inside of our waistband is lined with a smooth, soft layer — so all you feel is comfort, never the logo. A detail most brands skip entirely.
Stays Cool
Cooler to touch, cooler to wear. Bamboo fabric that actually regulates temperature.
Moisture Wicking
Pulls sweat away fast. You stay dry even when things heat up.
CleanSeam
No side seams, no pressure lines, nothing to remind you it’s there.
Superior Fit
Engineered to move with you and stay exactly where it should.
No Ride Up
Stays put from the first wear to the last hour of the day.
Swipe to explore →
Have Questions? We’ve Got Answers.
Yes. Your first pair is covered by our 60-day money back guarantee, so you can wear them, wash them and see how they feel through your everyday routine. If they’re not right for you, email hello@undiesmith.com within 60 days of delivery and we’ll refund that pair. Comfort is personal. You should get to decide for yourself.
Start by wearing and washing just one pair, keeping the rest unworn in their original packaging. If the fit or comfort isn’t right, contact us within 60 days of delivery. We’ll help you exchange or return the unworn pairs, and your first worn pair is covered by our first-pair money back guarantee.
Our boxer briefs fit true to size. Check your waist measurement against our size guide, and choose the larger size if you’re between sizes or prefer a little more room. They should feel comfortably secure around your waist and thighs without digging in. If your first pair doesn’t fit right, contact us and we’ll help arrange a size exchange.
Soft fabric is only the beginning. We combine superfine 50s bamboo viscose with smooth RunFree™ inner thigh panels, AirGrid™ rear ventilation and a softly lined SmoothBack™ waistband. Each detail is designed to address an everyday frustration—from rubbing between your thighs to heat building up below your waistband. Comfort you can feel, in places that matter.
They’re designed to stay in place as you move, with smooth RunFree™ inner thigh panels to help reduce friction. The stretch fabric follows your movement, helping you get on with your day with less adjusting. Getting the size right matters: for the best fit, the leg openings should gently hug your thighs without digging in.
Absolutely. Our 3D-contoured SculptPouch™ gives your jewels room to breathe, while a built-in elastic border gently keeps everything in place. Smooth, invisible seams mean no rough stitching rubbing against your most sensitive parts. Space where you want it. Support where you need it.
They’re designed with warm days and everyday movement in mind. The bamboo viscose fabric helps manage moisture, while the AirGrid™ rear panel adds ventilation below the waistband. Together, they help keep the areas that usually feel warm and clammy more comfortable, whether you’re at your desk or on the move.
It’s the layer you wear all day, so the details matter. Finer yarn, a shaped pouch, dedicated inner thigh panels and a softly lined waistband all contribute to how they feel against your skin. Our 4, 7 and 15 Packs bring down the price per pair, and every Australian order includes free shipping.
No hand washing needed. Machine wash cold with similar colours, then hang dry or tumble dry on low. Avoid bleach, ironing and dry cleaning. Following the care instructions helps protect the softness, stretch and fit, so they’re ready to go back into your everyday rotation.
Standard shipping is free on every Australian order, with no minimum spend. Estimated delivery is 2–7 business days after dispatch, depending on your location. Check the “Ships by” date above the Add to Cart button for your expected dispatch date.