How to Choose the Right Swim Trunk Inseam Length
The short answer: the 5 inch inseam is the best starting point for most guys, it sits just above mid-thigh, works on almost every body type, and is versatile enough for beach, pool, and everyday wear. If you're taller or want more coverage, go with the 7 inch inseam. If you prefer a bold, retro look, try the 4 inch inseam.
Not sure what swim trunk inseam length is right for you? Here's everything you need to know.
What Is Inseam Length in Swim Trunks?
The inseam length is the measurement from the crotch seam down to the bottom hem of the trunk. The shorter the inseam, the higher the hem sits on your thigh. The longer the inseam, the closer it gets to your knee.
Simple enough, right? Here's how the different lengths actually look and feel.
The Complete Guide to Swim Trunk Inseam Lengths
4 Inch Inseam: Bold and Minimal
This is the shortest option and it's not for everyone. A 4 inch inseam sits high on the thigh and gives a very retro, European-inspired look. Think of it as the swim trunk equivalent of short shorts.
Best for:
- Guys who want maximum tan lines (or none at all)
- A retro or fashion-forward look
- Shorter guys who find longer trunks overwhelming on their frame
- Pool days and beach lounging
Not ideal for surfing or active water sports where you need more coverage and freedom of movement.
At Bermies these are the Short and Short Liner styles.
5 Inch Inseam: The Sweet Spot
The 5 inch inseam is by far the most popular swim trunk length and there's a good reason for that. It sits just above mid-thigh, giving you a clean, modern look that's neither too short nor too long. It works on almost every body type and almost every occasion.
Best for:
- Most guys, most occasions
- Beach, pool, vacation, travel
- A versatile trunk that doubles as casual shorts
- Guys who want to look put-together without trying too hard
This is the Classic and Classic Liner at Bermies, and our best selling style.
6 Inch Inseam: Sleek and Versatile
The 6 inch inseam sits between classic and traditional. It gives a bit more coverage than the 5 inch while still keeping a modern, tailored look. A great middle ground for guys who want something slightly longer but not a traditional boardshort length.
Best for:
- Guys who like a slightly more covered look
- Versatile wear from water to street
- A slim, tailored fit that works for casual occasions too
At Bermies this is the Tailored style, which also comes with a built-in compression liner and a phone pocket.
7 Inch Inseam: The Traditional Length
The 7 inch inseam is the classic American swim trunk length. It falls just above the knee on most guys and gives a more relaxed, traditional fit. If you grew up wearing board shorts in the 90s, this is probably the length you're most comfortable with.
Best for:
- Guys who prefer more coverage
- A relaxed, traditional fit
- Taller guys who find shorter trunks look too minimal
- Casual beach and pool days
At Bermies these are the Long and Long Liner styles.
8 Inch Inseam: The Boardshort
The 8 inch inseam is the longest option and the closest to a traditional boardshort. It typically hits at or just above the knee and is designed for active water use, especially surfing.
Best for:
- Surfing and active water sports
- Guys who want maximum coverage and a boardshort feel
- Taller guys
- A more athletic, performance-oriented look
At Bermies this is the Boardshort Liner, a hybrid boardshort with built-in compression liner.
Quick Reference Guide
| Inseam | Style at Bermies | Best For |
| 4 inch | Short / Short Liner | Bold look, pool, beach lounging |
| 5 inch | Classic / Classic Liner | Most guys, most occasions |
| 6 inch | Tailored | Versatile, water to street |
| 7 inch | Long / Long Liner | Traditional fit, more coverage |
| 8 inch | Boardshort Liner | Surf, active water sports |
How to Choose Based on Your Height
As a general rule:
- Under 5'8": shorter inseams (4" or 5") tend to look more proportional
- 5'8" to 6'1": the 5" or 6" hit the sweet spot on most frames
- Over 6'1": a 6", 7" or even 8" can look more balanced and proportional
That said, there are no hard rules here. Wear what you feel good in.
How to Choose Based on What You're Doing
- Surfing or active water sports: go with the 8 inch Boardshort Liner
- Beach and pool vacation: 5 inch or 6 inch is perfect
- Traveling light and want one trunk that does everything: 5 inch Classic Liner or 6 inch Tailored
- Gym to beach days: 4 inch or 5 inch Short Liner for maximum mobility
- Just chilling at the pool: honestly any length works — pick what you like
Frequently Asked Questions
What does inseam mean in swim trunks?
The inseam is the measurement from the crotch seam down to the bottom hem of the trunk. A shorter inseam means a higher hem; a longer inseam means the trunk falls closer to your knee.
What is the most popular swim trunk inseam length?
The 5 inch inseam is the most popular length. It sits just above mid-thigh, works on most body types, and is versatile enough for beach, pool, and casual everyday wear.
What inseam length should I choose based on my height?
Under 5'8" tend to look best in 4 or 5 inch inseams. Between 5'8" and 6'1" work well with 5 or 6 inch. Over 6'1" often look more proportional in 6, 7, or 8 inch.
Are longer swim trunks better for swimming?
Not necessarily. Longer trunks (7–8 inch) provide more coverage and are great for surfing. Shorter trunks (4–5 inch) offer more freedom of movement and dry faster. The best length depends on what you're doing.
What is the difference between swim trunks and boardshorts?
Boardshorts typically have a longer inseam (7–9 inches) and a more fitted cut designed for surfing. Swim trunks generally have a shorter inseam, an elastic waistband, and a more relaxed fit for casual beach and pool use.
Can swim trunks be worn as regular shorts?
Yes, especially shorter inseam styles (4–6 inch). The 5 inch Classic and 6 inch Tailored at Bermies are designed to double as casual shorts and dry fast enough to wear all day.
The Bottom Line
If you have no idea where to start, start with a 5 inch inseam. It's the most versatile, the most flattering on most body types, and the most wearable across different occasions. You can always add a shorter or longer pair to the rotation once you know what you like.
Still not sure? Check out the and use the inseam filter to narrow it down. And if you want the added comfort of a built-in liner, all our styles come in a compression liner version too.
