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Well-fitted swim trunks stay up at the waist without cinching, sit at your natural waistline, end around mid-thigh or just above the knee, and leave room to walk, sit and swim without bunching or riding up. Four things decide that: waist, inseam, rise and liner. This guide shows how to check each one, how to measure yourself, and how to tell when a pair is too tight or too loose.
Start here, because the waist is the part that decides whether everything else stays where it should.
A good waist is secure without digging in. One men’s style guide puts the target as just tight enough that the trunks stay up without relying on the drawstring. That is a useful test: loosen the drawstring fully, stand up, and squat or walk a few steps. If the trunks stay put, the size is right. If they slide, size down or look at a cut with a different waistband.
The drawstring is for fine adjustment. Wet fabric is heavier, and trunks that fit perfectly dry can drop a little in the water. Tying a flat, snug bow, not a tight knot, gives you the margin you need without leaving a red line on your skin after an hour.
What to check at the waist:
Inseam is the measurement from the crotch seam down to the hem along the inner leg. It controls how much thigh shows, and it is the fit detail most people notice first.
Men’s Health describes 4 to 5 inch inseams as ending mid-thigh, and 6 to 8 inch inseams as shorts length. Here is how that translates to everyday choices:
| Inseam | Where the hem falls | Best for |
|---|---|---|
| 4 to 5 inches | Mid-thigh | Pool days, shorter men, a more fitted look |
| 6 to 7 inches | Just above the knee | The most versatile length for beach and pool |
| 8 inches and up | At or near the knee | Boardshort-style coverage, surfing, active water sports |
A few practical rules for choosing:
If you like the idea of a drawstring pair in the mid-range, our rundown of drawstring swim shorts with inseams from 5 to 7 inches compares how each length wears.
Rise is the distance from the crotch seam to the top of the waistband. It decides whether trunks sit at your natural waist, on your hips, or somewhere in between.
For most men, a mid rise is the safest choice. The waistband sits at or slightly below the navel, the seat is covered, and the trunks stay in place when you bend over. One men’s style guide advises avoiding very low rise trunks unless you have long legs and a short torso, since pairs that sit low on the hips tend to look and feel off.
Signs the rise is wrong:
Both problems often get blamed on the waist size, so check the rise before you size up or down.
The leg opening matters as much as length. You want trunks that are not skin tight and do not carry a lot of excess fabric either. The same style guide notes that many American brands cut very wide leg openings, and that most men do better with a slimmer opening that is wide enough to slide as you sit and stand yet narrow enough not to billow.
A quick test: sit on the edge of a chair with your feet flat. The hem should move up slightly but not ride up to the crotch, and the fabric should not pull tight across the top of your thigh. Then take a long step. If the trunks restrict the stride, the leg opening or the thigh is too narrow.
Over-roomy pairs have a particular downside in the water. Excess fabric catches the current and drags, and Men’s Health points out that roomy boardshorts can swamp shorter or skinnier men, while still working well for surfing.
The liner changes how trunks fit more than most buyers expect. A mesh brief liner provides support and removes the need for underwear, which should not be worn under swim trunks anyway because it holds water and bunches. A pair without a liner drapes more freely and dries faster, and suits men who prefer to wear their own swim brief or jammer underneath.
When you try a lined pair, check:
Our four rules for choosing between them are in lined vs. unlined swim trunks.
Use this in the fitting room or at home when your order arrives. Wear the trunks for a few minutes and move around.
Signs they are too tight
Signs they are too loose
If you land between two sizes, decide by what bothers you more. Choose the smaller size if you tend to wear the drawstring snug and value a cleaner line. Choose the larger if you want room to move or if your thighs are the limiting measurement.
U.S. Masters Swimming notes that men’s swimsuit sizing generally uses waist circumference, and recommends comparing a careful waist measurement against the manufacturer’s chart because sizing varies by design. Follow these steps:
Write the numbers down and keep them with you. If you want the full approach, we explain it in five measurements designers use for buying swimwear online.
Online shopping has one rule: use the size chart of the specific brand. A medium from one maker is not a medium from another, and even within a single brand, a boardshort cut and a shorter trunk cut can differ. The research on this is consistent: take careful measurements and compare them with the manufacturer’s own chart.
Before ordering:
When you compare options, beach shorts in different cuts show how much length and shape vary from one product to another, so measure first and shop second.
Fit is the first thing a man notices about swim trunks and the last thing he thinks about when he buys them. He picks a print or a color, then finds out the waist slides, the leg opening billows or the hem lands in the wrong place.
We design our men’s swim shorts with the details that decide fit in mind: where the hem falls, how the waist holds, and how the shell and the liner work together. Our drawstring pairs come in inseams from 5 to 7 inches, so you can choose coverage by how you want to move, not by compromise.
Our advice is simple. Measure before you shop, decide on your inseam first, and treat the waist as the base everything else is built on. A well-made pair should feel like nothing at all once you are in the water.
Lital
If you have your waist and inseam numbers, browse our men’s swim shorts, designed by Lital Simel-Rhedrick with attention to detail and timeless style. Check each product page for the inseam and size details before you order.
Once you have the fit, our guide to styling swim trunks for summer outfits shows how to wear them on and off the sand.
Neither. They should be snug enough at the waist to stay up without the drawstring doing all the work, and roomy enough in the thigh to let you walk, sit and swim freely. Skin-tight pairs restrict movement, and very loose pairs catch water and sag.
It depends on the inseam you choose. A 4 to 5 inch inseam ends mid-thigh, and a 6 to 8 inch inseam reaches shorts length, according to Men’s Health. Most men find the 6 to 7 inch range the easiest to wear at both the beach and the pool.
No. Trunks with a built-in mesh liner are designed to be worn alone. Underwear holds water, bunches and can chafe. If your trunks are unlined, wear a swim brief or jammer underneath, not regular underwear.
Compare your measured waist with the brand’s size chart and check whether the shell has stretch. If the fabric is stiff, pick the larger size and use the drawstring. If it stretches, the smaller size usually gives a cleaner fit. Measuring your thigh as well helps you break the tie.
