Table of Contents
- Why the Type of Underwear You Wear Actually Matters
- The Main Types of Men’s Underwear Explained
- Pouch Underwear: The Style Built to Stop Chafing and Readjusting
- Briefs vs Boxer Briefs: Which Cut Suits You?
- The Best Underwear Materials for Men
- The Best Underwear for Exercise, Running and Cycling
- Underwear for Long Days: Desk Jobs, Travel and Hot Work
- How to Choose the Right Underwear for Your Body and Needs
- Types of Women’s Underwear: A Quick Reference
- Fit Troubleshooting: Waistbands, Ride-Up and Sizing
- Caring for Your Underwear So It Lasts
- Underwear and Testicular Health: What the Evidence Says
- Conclusion: Matching the Right Type of Underwear to Your Day
- Frequently Asked Questions
Last Updated: October 13, 2026
Why the Type of Underwear You Wear Actually Matters
Boxer briefs pulled in 33.7% of global men’s underwear revenue in 2025, according to Grand View Research’s men’s underwear market report.
Here’s the thing though. Revenue share tells you what’s popular, not what’s right for you. The types of underwear you choose change how you feel by 3pm, whether you chafe on a 10km run, and how often you’re discreetly adjusting yourself in a meeting.
Below, we’ll break down every major cut, the materials that actually perform, and how to match the right pair to your day. No fluff, no filler.
The global men’s underwear market was estimated at USD 36 billion in 2026, per Business Research Insights’ market size data, so there’s no shortage of options. The problem is choosing well.
Fit beats fashion every time. A $10 pair that matches your build and activity will outperform a $50 pair that doesn’t.
The Main Types of Men’s Underwear Explained
Most types of underwear for men fall into four core cuts: briefs, trunks, boxer briefs, and boxer shorts. Each sits differently on the hip, covers a different amount of leg, and suits a different body and activity.
Get the cut right and everything else, fabric, waistband, pouch design, falls into place. Get it wrong and no amount of “premium” marketing will save your thighs.
Let’s go through them properly.
Briefs
Briefs are the classic Y-front or bikini-cut style with no leg extension, sitting high on the hip and offering full support through a snug pouch. They’re the lightest option, the least fabric against your skin, and still the go-to for men who want zero movement during the day.
The trade-off is leg coverage. Briefs leave your inner thighs exposed to each other, which is exactly where chafing starts for men with thicker thighs. If you’re a desk worker with a slim build, that’s a non-issue. If you’re built solid and active, it’s the whole ballgame.
We stock a Mens Blue Cotton Briefs Lotus for guys who want that classic cut in a breathable cotton build.
Trunks
Trunks sit between briefs and boxer briefs: a short leg that ends high on the thigh, usually with a mid-rise waistband. They give you more coverage than a brief without the fabric volume of a boxer brief.
For men who run hot, trunks are a smart middle ground. Less material means less heat trapped, but you still get some separation between the thighs. Our Toucan Mens Cotton Trunks are a solid example of the cut done right.
Boxer Briefs
Boxer briefs combine a snug, supportive fit with a leg that extends to mid-thigh. They’re the best-selling cut in the world for a reason: they hold everything in place without riding up, and the longer leg reduces skin-on-skin friction.
The catch is that a cheap boxer brief rolls, bunches, and rides up the moment you walk. Fit and fabric quality matter more here than in any other cut.
Check the inseam before you buy. A 15.5cm leg on a boxer brief is the sweet spot for most builds, long enough to stop ride-up without bunching under trousers.
Boxer Shorts
Boxer shorts are loose, unstructured, and offer no support. They’re fine for sleeping or lounging at home. For anything involving movement, they’re the weakest option on this list, and that’s being generous.
Pouch Underwear: The Style Built to Stop Chafing and Readjusting
Pouch underwear is a category of men’s underwear built with a dedicated compartment that separates the genitals from the thighs, reducing skin-on-skin contact and the need for constant adjustment. That separation is the entire point.
Standard underwear presses everything together. Walk a few kilometres in the heat and you’ll feel exactly why that’s a problem.
This is where SLY Collective built its entire range. Our engineered inner separation pouch keeps everything in place, and our 95% bamboo viscose performance fabric moves moisture away from the skin instead of trapping it.
Our Black Tie Dye Boxer Briefs are $22.95 and built on exactly this design, with a 3D-contour pouch and a mid-thigh leg that won’t ride up.
Men who chafe, overheat, or find themselves adjusting all day, especially during exercise, long commutes, or hot work environments.
Briefs vs Boxer Briefs: Which Cut Suits You?
Briefs win for minimal fabric and maximum airflow. Boxer briefs win for thigh separation and all-day stability. The right pick depends on your build, your activity, and how much you chafe.
If you’re slim, mostly seated, and run cool, briefs are lighter and cheaper. If you’re active, carry more muscle on your thighs, or work in heat, boxer briefs do more work for you.
| Factor | Briefs | Boxer Briefs |
|---|---|---|
| Leg coverage | None | Mid-thigh |
| Chafe risk | Higher for thicker thighs | Lower |
| Heat retention | Lowest | Moderate |
| Ride-up risk | Low | Higher in cheap fabrics |
| Best for | Slim builds, desk work | Active men, hot climates |
The honest answer most guides skip: if you’ve never had a chafing problem, briefs are fine. If you have, stop buying them.
The Best Underwear Materials for Men
Fabric decides how a pair feels at 7am and how it feels at 7pm. Two pairs in the same cut can behave completely differently depending on fibre, weave, weight and how the seams are built. This is the part most style guides skip, and it is the part that determines whether you chafe, overheat or stay comfortable.
Fibre by fibre
Cotton is breathable, affordable and familiar, and it remains the dominant fibre in men’s underwear.
Bamboo viscose wicks moisture away from the skin rather than holding it, feels soft against sensitive skin, and regulates temperature in both directions. It is the fibre we build our range on, at 95% bamboo viscose.
Microfibre and synthetic blends dry fast and stretch well, which makes them popular for sport. The trade-off is that they can trap odour and irritate reactive skin, especially when the synthetic content is high.
Merino wool regulates temperature exceptionally well and resists odour naturally, but it costs more and needs careful washing to avoid shrinkage.
| Fibre | Breathability | Moisture handling | Stretch | Care |
|---|---|---|---|---|
| Cotton | High | Absorbs and holds | Low unless blended | Easy, tolerates heat |
| Bamboo viscose | High | Wicks away | Moderate | Cool wash, air dry |
| Microfibre blend | Moderate | Fast-drying | High | Easy, avoid high heat |
| Merino wool | High | Wicks and resists odour | Moderate | Hand or gentle cycle |
Construction matters as much as fibre
A great fibre in a badly built garment still chafes. Three construction details do most of the work:
- Seams. Flatlock or bonded seams lie flat against the skin. Raised overlocked seams rub under repetitive motion, which is why they cause problems on long runs and rides.
- Waistband. A soft, wide, non-rolling band distributes pressure instead of digging in. Narrow bands with stiff elastic are the usual cause of rolling and pinching.
- Gusset and pouch. A contoured pouch or a shaped gusset holds everything in position without compression, which reduces friction and the need to adjust.
Care and longevity
Heat is what kills elastic and breaks down fibres, so wash cooler and dry gentler. A practical routine:
- Wash at 30°C or below.
- Skip fabric softener, which coats fibres and reduces wicking.
- Air dry where you can, and avoid a hot dryer.
- Rotate enough pairs that no single pair is worn into the ground.
With proper care, a quality pair typically lasts 12 to 18 months, and cheap cotton usually less.
Match the fibre to the day: cotton for cool, seated days; bamboo viscose or microfibre for heat, movement and long hours; merino for temperature swings and travel.
The Best Underwear for Exercise, Running and Cycling
For exercise, the best underwear is a snug boxer brief or trunk in a moisture-wicking fabric with a supportive pouch. Loose cotton is the worst possible choice for a run or a ride.
Friction is the enemy here. Every stride and pedal stroke generates heat and movement between your thighs. Without separation and moisture control, you’re building a chafe from the first kilometre.
Look for three things: a leg that stays put, a fabric that moves sweat away from skin, and a pouch that holds everything without compression.
Our customers regularly tell us the pouch design is what changed their training.
For cyclists specifically, a longer leg reduces saddle friction, so boxer briefs beat trunks. For runners, either works as long as the fabric wicks.
Underwear for Long Days: Desk Jobs, Travel and Hot Work
Long days punish bad underwear faster than anything else. Eight hours in a chair, a full day of travel, or a shift in the heat will expose every flaw in your choice.
Sitting compresses fabric against the body and traps heat. Add a long flight or a full day of driving and you get sweat, pressure points, and the constant urge to adjust.
For travellers, a hidden stash pocket is a small but genuinely useful detail.
For tradespeople working outdoors, moisture-wicking bamboo beats cotton outright. Cotton stays wet, and wet cotton against skin for ten hours is how you end up with a rash.
How to Choose the Right Underwear for Your Body and Needs
Choosing well comes down to four questions: how much you move, how hot you run, how much you chafe, and what you’re wearing over the top.
Work through it in order:
- Assess your activity. Seated all day? Briefs or trunks. Active or on your feet? Boxer briefs.
- Check your build. Thicker thighs need leg coverage. Slim builds can wear anything.
- Match the fabric to your climate. Hot or humid conditions call for moisture-wicking bamboo or microfibre.
- Consider your outerwear. Fitted trousers show visible panty lines less with seamless or flat-seam construction.
- Factor in sensitivity. Reactive skin does better with soft, hypoallergenic bamboo over synthetic blends.
If you get chafing, overheating, or ride-up more than occasionally, the cut is usually the culprit, not your body.
Types of Women’s Underwear: A Quick Reference
Women’s underwear follows the same logic as men’s: the cut sets the rise, the rear coverage and the leg opening, while the fabric decides how it behaves across a full day. Learn those three variables and you can read any style name on a label without guessing.
Here is how the main cuts actually differ.
| Style | Rise | Rear coverage | Leg opening | Best for |
|---|---|---|---|---|
| Brief | High (at or above the navel) | Full | High-cut, sits on the hip | Everyday comfort, full coverage under trousers |
| Bikini | Low to mid | Moderate | Cut away at the hip | Warm weather, light or loose clothing |
| Hipster | Mid | Moderate to full | Sits on the hip bone | Everyday wear, low-rise jeans |
| Boyshort | Mid | Full | Extends down the thigh | Coverage under skirts and dresses |
| Cheeky / Brazilian | Low to mid | Partial (half the rear exposed) | Cut high at the leg | A middle ground between full briefs and a thong |
| Thong | Varies | Minimal (narrow strip at the back) | High-cut | Fitted clothing, no visible lines |
| G-string | Varies | Minimal (string at the back) | High-cut | Minimal coverage, minimal lines |
| High-waist | High | Full | Sits above the navel | Support, smoothing, post-partum comfort |
How to read the differences
Rise is where the waistband sits: low-rise rests on the hips, mid-rise sits at or just below the navel, and high-rise covers the navel. Rise is the single biggest reason a pair that fits one person digs in on another, so match it to the rise of your outerwear rather than to a size label.
Rear coverage runs from full (briefs, boyshorts, high-waist) through partial (cheeky and Brazilian cuts) to minimal (thongs and G-strings). Coverage is a comfort and visibility decision, not a modesty one, and it is entirely personal.
Leg opening determines whether a pair stays put or rides up. A higher-cut leg opening moves with the hip; a lower, snugger opening holds position under movement.
Fabric and construction
Cotton remains the default for breathability and everyday wear, while blends with a small amount of elastane add stretch and help the garment hold its shape through repeated washing. For period underwear and sanitary styles, absorbent layers are built into the gusset, which changes both the fit and the care requirements: rinse before washing, avoid fabric softener, and follow the maker’s temperature guidance so the absorbent layer keeps working.
Seamless and bonded construction reduces visible lines under fitted clothing. Flat seams and laser-cut edges do the same job without bulk.
If a pair rides up, the leg opening is usually too loose or the fabric has lost its recovery. Sizing down rarely fixes it; a different cut or a fabric with better stretch recovery usually does.
Inclusive fit notes
Cut names are not gendered rules. The same styles work across body shapes, sizes and gender identities, and the practical questions are always the same: where does the waistband sit, how much rear coverage do you want, and how much movement will the day involve. For anyone with mobility needs, higher-rise cuts with a wider waistband are often easier to manage independently, and side-opening or adaptive designs exist for people who dress seated.
We carry a few women’s styles too, including the Blue Bird Cotton Bikini and Leopard Knickers, both in cotton blends designed for everyday wear.
Fit Troubleshooting: Waistbands, Ride-Up and Sizing
Most fit problems come down to three culprits: the wrong size, the wrong rise, or a fabric with no memory.
Ride-up happens when the leg opening is too loose or the fabric stretches out through the day. A snugger leg with flat stitching holds position.
Waistband rolling usually means the band is too narrow or the elastic has given out. A soft, wide, non-rolling waistband fixes this, which is why we build ours that way.
Sizing is the most common mistake. Measure your waist at the hip bone, not where you wear your jeans, and check the brand’s own size guide rather than assuming your usual size carries over.
- Ride-up → tighter leg opening, better fabric recovery
- Rolling waistband → wider band, less worn elastic
- Chafing → more leg coverage, moisture-wicking fabric
- Constant adjusting → pouch design that holds position
Caring for Your Underwear So It Lasts
Underwear lasts longer when you wash it cooler, dry it gentler, and rotate more pairs. Heat is what kills elastic and breaks down fibres.
Wash at 30°C or below, skip the fabric softener, and avoid the dryer where you can. Air drying preserves the waistband and keeps bamboo and cotton blends in shape far longer.
Buy enough pairs to rotate. Wearing the same five pairs into the ground wears them out faster than owning ten and cycling through them. Most men get 12 to 18 months from a quality pair with proper care, less from cheap cotton.
Underwear and Testicular Health: What the Evidence Says
That’s worth stating carefully. The study shows an association between self-reported underwear habits and measured markers. It does not establish that underwear style causes those differences.
Temperature is the working theory. Tighter underwear holds the testes closer to the body, which can raise scrotal temperature. But the research is observational, and many factors influence fertility.
If you’re trying to conceive or have concerns about testicular health, talk to a doctor. Underwear choice is one small variable among many.
Conclusion: Matching the Right Type of Underwear to Your Day
The best type of underwear is the one that matches how you actually spend your day: the cut for your build, the fabric for your climate, and the support for your activity.
If you’re tired of chafing, adjusting, and overheating, that’s a design problem, and it’s solvable. SLY Collective builds engineered pouch underwear with a 95% bamboo viscose performance fabric, an inner separation pouch that stops friction at the source, and a soft non-rolling waistband that stays put from morning to night. We’ve been making it here since 2005, and it’s urologist recommended.
Shop our best sellers and find the pair that finally fits your day.
Frequently Asked Questions
What is the difference between briefs, trunks and boxer briefs?
All three are close-fitting, but leg length separates them. Briefs have no leg extension and sit high on the thigh. Trunks add a short leg, usually ending well above mid-thigh. Boxer briefs extend further, often to mid-thigh, so they stay put under trousers. Boxer briefs are the biggest seller in the men’s underwear market, holding 33.7% of global revenue share in 2025, according to Grand View Research. Choose briefs for minimal fabric, trunks for a middle ground, and boxer briefs if you want a longer leg that resists ride-up.
Which type of underwear is best for exercise?
Look for a close, supportive fit, a fabric that moves moisture away from skin, and flat seams that sit flush against the body. Cotton is comfortable but holds sweat, so a bamboo viscose or performance blend works better for gym sessions, 10km runs and cycling. A pouch design that keeps skin separated reduces friction where chafing starts. Avoid loose boxer shorts for high-friction activities, because the fabric shifts and rubs. If you train most days, buy several pairs of the same style so you are never caught short on laundry day.
What is the difference between a full brief and a midi brief?
The difference comes down to how much coverage each style gives across the rear and hip. A full brief sits higher on the waist and covers more of the bottom, which is why it is often chosen for everyday wear and under looser clothing. A midi brief sits slightly lower with a bit less coverage at the back, so it feels lighter but shows more. Neither is better in absolute terms. If you dislike the feeling of fabric riding up, the fuller cut usually stays in place more reliably.
How do I choose underwear that helps prevent chafing?
Start with fit, then fabric, then seams. Underwear that is too loose shifts and rubs; too tight pinches and traps heat. A supportive pouch that holds everything in place stops skin-on-skin friction, which is the usual cause of chafe between the thighs and under the scrotum. Choose moisture-wicking fabric over heavy cotton for sweaty conditions, and check that seams are flat rather than raised. Replace anything with worn elastic or pilling, because rough edges cause irritation even when the fit is right.
Does underwear fabric affect comfort and temperature regulation?
Yes, and it matters more than most people expect. Cotton held 68.4% of the global men’s underwear market’s revenue share in 2025, according to Grand View Research, largely because it is soft and breathable. The trade-off is that cotton holds moisture once you sweat. Bamboo viscose and performance blends dry faster and move heat away from the body, which helps in hot workplaces, on long flights and during training. Whichever you pick, check the waistband and seams too, since those cause as much discomfort as the fabric itself.
Which underwear styles offer the most coverage?
Full briefs, high-waist styles and longer boxer briefs give the most coverage. Full briefs cover the hip and rear generously, while boxer briefs with a mid-thigh leg protect against thigh rub under trousers. If you want maximum coverage for work or travel, a longer leg combined with a supportive pouch is the practical combination. Styles such as thongs, G-strings and low-rise bikinis deliberately offer less, which suits fitted clothing but not long days of movement.
Why are my undies wet but I didn’t pee?
Sweat is the usual explanation. The groin area has a high concentration of sweat glands, and sitting for hours, training hard or wearing non-breathable fabric traps that moisture against the skin. It is rarely a sign of anything serious on its own. Switching to moisture-wicking fabric, avoiding tight synthetic layers and changing out of damp underwear after exercise all help. If the wetness is persistent, has an unusual smell, or comes with irritation or pain, see a doctor rather than self-diagnosing.
Does the type of underwear you wear affect fertility?
Research published in Human Reproduction in 2018 found that men who reported most frequently wearing boxers had higher sperm concentration and total sperm count, and lower FSH levels, than men who did not. That is an association between self-reported habits and measured markers, not proof that underwear style causes the difference. If you are trying to conceive or have concerns about fertility, speak to a doctor rather than relying on a change of underwear.