Most blokes give their underwear about as much thought as they give their socks. You grab what’s familiar, buy a six-pack, and call it done. But the different types of guys underwear available today vary enormously in fit, fabric, support, and purpose. Choosing wrong means chafing on a long day, visible lines under your pants, or just a nagging discomfort you’ve learnt to ignore. This guide cuts through every major style, explains what each one actually does well, and gives you the specific information you need to find what works for your body and your day.
1. Key criteria to consider before choosing a style
Before you land on a specific style, it helps to know what you’re actually optimising for. Most men focus entirely on brand or aesthetics and end up overlooking the factors that determine whether underwear actually works.
Here’s what genuinely matters:
- Fabric and breathability. The material touches your skin all day. Natural fibres like cotton and bamboo breathe well and feel soft. Synthetic blends handle moisture better under physical exertion. The choice depends on your climate and activity level.
- Inseam length. This is the single most overlooked measurement in men’s underwear. Too short and you get ride-up and chafing. Too long and the fabric bunches under trousers. Matching inseam length to your thigh shape and trouser cut makes a real difference.
- Pouch design and support. A structured pouch keeps everything in place and prevents chafing against your inner thigh. Flat-front designs offer no separation, which can be uncomfortable over a long day.
- Sizing beyond the waistband. Many men size their underwear purely by waist measurement, but rise height and seat room also vary significantly between brands and styles.
- Activity and temperature. What you wear to the gym should not be the same as what you wear in a boardroom or on a hot summer afternoon.
Pro Tip: If you sit at a desk most of the day, prioritise rise height and fabric softness. If you’re on your feet or sweating, focus on moisture management and inseam length.
2. An overview of the different types of guys underwear
This is the core of what men actually need to know: the distinct underwear styles, what makes each one unique, and where each one shines or falls short.
| Style | Inseam | Support level | Best for |
|---|---|---|---|
| Boxers | None | Low | Lounging, sleeping |
| Briefs | None | High | Everyday, active |
| Boxer briefs | 3-5 inches | High | All-day wear |
| Trunks | 2-3 inches | Moderate-high | Fitted clothing |
| Thongs | None | Minimal | No visible lines |
| Jockstraps | None | Very high | Sport, gym |
| Long leg boxers | 6+ inches | Moderate | Chafe prevention |
Boxers
Traditional boxer shorts for men are cut loose through the leg and sit at the waist like a short pant. That roominess is great for air circulation and feels comfortable at home, but it creates real problems under fitted clothing. Boxers tend to bunch, ride up, and offer zero support for physical activity. They’re a solid choice for sleeping or relaxed weekend wear, but most men find them impractical as an everyday option.
The trade-off: comfort and breathability versus support and practicality under clothing.
Briefs
Briefs are the most structured style. A snug cut, no leg fabric, and a supportive pouch that holds everything close to the body. They were considered old-fashioned for years, but briefs have made a genuine comeback because they work exceptionally well under fitted suits, slim-cut trousers, and activewear. There’s no excess fabric to bunch or ride up.
The types of men’s briefs now range from the classic full-rise cut to low-rise, mid-rise, and athletic cuts. Higher-rise briefs offer better coverage and are generally more comfortable for longer days.
The trade-off: excellent support and minimal bulk versus heat retention and exposed thighs.
Boxer briefs
Boxer briefs dominate the market, representing 55 to 65 per cent of retail unit sales. That’s not marketing hype. It reflects the fact that boxer briefs genuinely balance support, coverage, and comfort better than any other single style. The longer leg prevents inner thigh friction, the snug waistband keeps things in place, and the fit works under almost any clothing.
Different types of mens boxers in the boxer brief category vary mainly in inseam length and rise height. A shorter inseam boxer brief starts to look and feel more like a trunk. A longer inseam provides meaningful chafe protection.
The trade-off: excellent all-round fit, though some men find them warm in summer.
Trunks
Trunks sit between briefs and boxer briefs. The leg opening is similar to a brief, but there’s a 2 to 3 inch inseam that adds a fraction of thigh coverage. They have a square, fitted silhouette that looks clean under slim trousers and works well for men with average thigh width.
Pro Tip: Trunks are the go-to choice if you want the minimal look of a brief but need just enough leg coverage to stop friction at the inner thigh.
Thongs
Thongs eliminate all visible underwear lines under fitted pants or athletic wear. They offer almost no support and take some getting used to, but for men who’ve struggled with visible lines under specific clothing, they solve a genuine problem. Not for everyone, but they fill a real niche.
Jockstraps
A jockstrap has a supportive pouch at the front and two elastic straps at the back, leaving the seat fully exposed. They were designed for sport and still serve that purpose well. The level of front support is unmatched by any other style. Outside of athletic use, they’re impractical for everyday wear.
Long leg boxers
Long leg boxer briefs or compression shorts extend past the mid-thigh, sometimes reaching the knee. They were originally worn by cyclists and runners to prevent chafing, but men with fuller or more muscular thighs wear them daily. Inseams of 6 inches or more keep the fabric in place throughout the day.
3. How fabric shapes comfort and performance
The style of your underwear matters, but what it’s made from affects how it feels every hour you wear it. This is where most men leave real comfort on the table.
- Cotton and cotton blends make up 55 to 60 per cent of unit volume in the market. Cotton is soft and familiar, but it absorbs and holds moisture. On a hot or active day, wet cotton is uncomfortable and slow to dry.
- Bamboo fabric offers a strong alternative to cotton. It’s naturally breathable, temperature-regulating, and significantly softer than standard cotton. Bamboo fibres are also biodegradable, which appeals to men who care about the environmental impact of their wardrobe.
- Modal and micromodal are cellulose-based fibres known for exceptional softness and a silky feel. They’re durable, resist shrinkage, and stretch without losing shape. The luxury segment is growing steadily as men prioritise everyday comfort.
- Performance synthetics (polyester, nylon, spandex blends) are the right call for the gym. Synthetic blends outperform cotton in moisture management and durability in active, humid conditions. They dry fast, resist odour-causing bacteria, and hold their shape under movement. Performance fabric growth is running at 9 to 11 per cent annually in 2026, outpacing even the modal and luxury segment.
- Seam construction is the final piece. Heat-bonded or Free Cut Fusing seams eliminate the raised stitching that causes irritation across the inner thigh and waistband area. This approach is becoming more common as brands respond to consumer demand for all-day wearability.
Market trends in 2026 show a clear shift toward everyday functionality. Natural fabric colours and cooling properties are taking priority over bold graphics and flashy branding.
4. Inseam length and why it matters more than you think
Inseam length is critical for preventing chafing and ride-up, yet most men have never consciously chosen underwear based on inseam. They buy by waist size and leave everything else to chance.
Here’s a practical comparison:
| Inseam length | Style examples | Ideal body type | Best activity |
|---|---|---|---|
| No inseam | Briefs, thongs | Slim thighs, minimal friction | Low activity, fitted clothing |
| 2-3 inches | Trunks | Average thighs | Everyday office wear |
| 3-5 inches | Boxer briefs | Most body types | All-day use, casual activity |
| 6+ inches | Long leg boxer briefs | Fuller or muscular thighs | Active days, gym, cycling |
The logic is straightforward. A shorter inseam leaves inner thigh skin exposed to friction against itself or against fabric. For men with slim thighs, this is rarely an issue. For men with more muscular or fuller thighs, a short inseam guarantees chafing within hours.
Body type and activity level are the two main factors in choosing inseam length. Briefs suit slim fits and low-friction thighs. Trunks work for men with average muscular development. Long leg boxer briefs are the right call for muscular or fuller thighs, and for anyone spending a long day on their feet.
Inseam also affects appearance under clothing. Under slim-cut trousers or shorts, a longer inseam can create a visible line at the thigh. For warmer weather and lighter clothing, a shorter inseam keeps the look cleaner.
Pro Tip: If you regularly experience chafing or ride-up by mid-afternoon, move up one inseam length category before trying a different style. The problem is almost always inseam, not fabric.
5. Special considerations for different body types and specific needs
The underwear options for men at standard sizing work for most builds, but there are genuine fit differences worth understanding for men outside that range.
Big and tall sizing
Big and tall underwear is not simply a scaled-up version of standard sizing. Proper big and tall sizing increases the waist by 3 to 4 inches while also adding 2 to 3 inches to the torso rise and inseam through separate grading increments. This proportional adjustment is what separates genuinely well-fitting underwear from a standard pair that’s just labelled a larger size.
What to look for in big and tall options:
- Wider waistbands that sit flat without rolling or digging in
- Deeper seat room that follows the natural shape of a larger frame
- Reinforced stitching at the inner thigh and seat seam, where stress on the fabric is highest
- Extended rise so the waistband sits comfortably at the natural waist rather than pulling down
- Longer inseam options that maintain inner thigh coverage without riding up
Separate pattern grading is the key to a silhouette that looks proportionate and feels comfortable at larger sizes.
Supportive pouch designs
A contoured or hammock-style pouch positions the anatomy forward and away from the body. This reduces friction, manages temperature more effectively, and simply feels more comfortable over a long day compared to a flat-front design. For men who spend extended periods sitting, driving, or in physical activity, a pouch design makes a genuine difference. It’s also a feature linked to temperature control and sperm health, given that scrotal temperature management is understood to influence sperm production.
6. The best underwear for guys: matching style to lifestyle
Picking the best underwear for guys is not about landing on one universal answer. It’s about matching style, fabric, and inseam to what your day actually looks like.
Here’s a practical summary:
| Situation | Recommended style | Why |
|---|---|---|
| Office, formal wear | Briefs or trunks | Minimal bulk under tailored clothing |
| Casual, everyday | Boxer briefs | All-round fit and comfort |
| Gym or sport | Performance boxer briefs or jockstrap | Moisture management and support |
| Summer heat | Bamboo briefs or trunks | Breathability and temperature control |
| Sleep or lounging | Boxers | Loose, unstructured, relaxed |
| Chafe prevention | Long leg boxer briefs | Extended inseam for thigh coverage |
The different types of underwear for men available now are genuinely varied. There is no one-size-fits-all answer, but there is a right answer for your specific body, lifestyle, and daily demands.
My take on choosing underwear that actually works
By Sharon
I’ve reviewed and written about men’s underwear long enough to have one firmly held opinion: most men are wearing the wrong style, and they have no idea it’s costing them comfort every single day.
The conversation I hear most often goes like this. A bloke switches from boxers to boxer briefs because someone told him to, finds them slightly better, and concludes that’s as good as it gets. He’s never thought about inseam length. He’s never noticed that his chafing only happens in a specific pair. He’s never considered that the fabric might be working against him in summer.
What I’ve learnt is that the decision about which underwear to wear is less about style and more about honestly knowing your own body. If you have muscular thighs, a 3-inch inseam is not doing the job. If you run hot, cotton is holding moisture against your skin for hours longer than necessary. These are not complicated revelations. They’re just things most of us never bothered to think through.
The other thing I feel strongly about is fabric. Bamboo in particular is genuinely underrated. It’s softer than most cottons out of the wash, it breathes better in warm weather, and it holds up without losing shape over time. Once you wear good bamboo underwear for a week, going back to a standard cotton brief feels noticeably worse.
My honest advice: buy two or three different styles in the same fabric and wear each one for a full day. Notice what bothers you. That process teaches you more than any guide can.
— Sharon
Find the right fit with Sly Collective
If this guide has you rethinking what’s in your drawer, Sly Collective is a good place to start the next chapter. The Australian-owned brand has been making men’s underwear since 2005, and their focus is specifically on fit, support, and fabric quality rather than volume. Their men’s pouch underwear range uses anatomical hammock pouch construction, bamboo fabric, and longer leg cuts to address the exact comfort and chafing issues this article covers. For men who want help navigating the range or finding a gift, the underwear gift picks for 2026 are a well-curated starting point. If you want a detailed breakdown of what to look for before buying, Sly Collective also publishes a practical buying criteria checklist that goes deeper than the average product page.
FAQ
What are the main different types of guys underwear?
The main styles are boxers, briefs, boxer briefs, trunks, thongs, jockstraps, and long leg boxer briefs. Each differs in inseam length, support level, and fit, making them suited to different body types and daily activities.
Which underwear style do most men wear?
Boxer briefs are the most popular style, holding 55 to 65 per cent of the men’s underwear market. They balance support, coverage, and everyday comfort better than any other single style.
What inseam length stops chafing for men with muscular thighs?
A longer inseam of 6 inches or more, as found in long leg boxer briefs, provides the best chafing and ride-up protection for men with fuller or muscular thighs.
Is bamboo underwear actually better than cotton?
Bamboo is softer, more breathable, and more temperature-regulating than standard cotton, making it a strong choice for all-day wear. It also biodegrades more readily, which matters to men thinking about the environmental footprint of their clothing.
How do big and tall men’s underwear sizes differ from standard?
Big and tall sizing uses separate pattern grading that increases the waist by 3 to 4 inches while also adding proportional length to the rise and inseam. It is not simply a scaled-up standard size.