Most men buy swim trunks the night before a trip, and most of them buy the wrong size. BOJIN, a menswear brand better known for printed Hawaiian shirts and cargo pants, sells a range of inexpensive swimwear aimed squarely at that moment. Four pieces sit side by side here: a 9-inch quick-dry trunk with a mesh lining at $19.99, a 9-inch board short with zippered pockets at $23.99, a shorter trunk with a built-in compression liner at $9.99, and a long-sleeve UV rash guard at $5.99.
The 9-inch trunk is the one most people buy. It has 3,321 Amazon ratings and a 4.5-star average, far more evidence than the other three combined. The zipper version is its closest sibling. The liner trunk and the rash guard are newer and less reviewed, and you will find no buyer quotes for either of them here, because the listings had none to read.
If you are shopping for yourself, a partner, a son or a father, the thing that decides it is size. On the 9-inch trunk's listing, buyers who discuss sizing are more often unhappy than happy. That single fact changes how you should order, and it is the thread through the rest of this review.
BOJIN 9-inch quick-dry swim trunks
BOJIN Men's 9-Inch Quick-Dry Swim Trunks
$19.99at our last price check
Design and fabric
This is a classic knee-length trunk. The listing says the 9-inch inseam "hits your knee", the waistband is elastic with a drawstring, and the fit is relaxed. Inside is a mesh lining, which the bullets say keeps the shorts from ballooning when you are underwater. Outside there are three pockets: two slanted side pockets made of mesh, and a back cargo pocket with a flap, a hook-and-loop closure and a drain hole.
The fabric is 92% polyester and 8% elastane, according to the detail table, with "High Stretch" and a "Lightweight" class. The bullets call it a 4-way stretch fabric that is water repellent and quick-drying. Polyester at that share does not absorb much water, which is what makes a trunk dry quickly once you climb out of the pool, and 8% elastane is enough stretch to sit cross-legged on a towel without the waistband digging in.
BOJIN's bullets also say the fabric is "UPF 50+". A UPF 50+ rating means the fabric lets through less than one fiftieth of the sun's UV. It only protects the skin under it, which on a 9-inch trunk is your hips and most of your thighs. Your back, shoulders and the lower thigh above the knee still need sunscreen.
Prints are where BOJIN goes wide. The photos show a teal-to-dark gradient, a grey shark print, green stripes, navy and light blue stripes, black and grey stripes and navy and white stripes. Color is one of the steadier themes in the buyer record, 23 of 25 mentions positive, and one buyer says "the color has not faded" after numerous washes.
The lining and the pockets
The mesh lining is the part of a trunk most men never think about until it fails. It is a light brief sewn inside the waistband, and its job is to hold everything in place so the outer trunk can stay loose. One buyer says the lining "does not ride up", which is the main thing you want from it. Another reports the inside "already ripped apart" after a single wear. Mesh is the most delicate part of any trunk, so if you are hard on swimwear, that is where to look first when a pair wears out.
BOJIN's pockets are basic but useful. Mesh side pockets drain instantly, which is why you see them on cheap trunks: a solid pocket would hold a cup of water every time you stood up in the pool. They have no closure, though, so anything in them can slide out when you sit down on a lounger. The back pocket is the safe one. It has a flap, a hook-and-loop strip and a drain hole, which makes it the place for a car key or a folded bill. If you need two secure pockets, the zipper trunk below is the better buy.
Fit and sizing
BOJIN lists eight sizes, from S to 5XL, which is a wider range than many swim brands offer and matters if you are shopping for a big man. The detail table calls the rise "Mid Rise". The listing does not print a waist range per size in the text we have, so the buyer reports are the best guide.
| Buyer's waist or pants size | Size bought | What happened |
|---|---|---|
| 36 to 38 | XL | "Great fit. Mesh lining does not ride up" |
| 38 | XL | "the waist was a little snug" |
| 38 | Not stated | "fit without riding down when bending/swimming" |
| 40 | XXL, per the size chart | "fit well but were a little baggy on me" |
| Between 46 and 48 | 5XL | "these were perfect", for a strongman with large thighs |
| Not stated | 5XL | "didn't feel much different than a 4x" |
Read across the table and two things show up. At the middle of the range, an XL works for a 36 to 38 waist, though one 38 found it snug. And at the top of the range, the step between sizes may be small: one buyer felt little difference between 4XL and 5XL, and another thinks the larger men's sizes run "2 sizes small". The sizing theme on the listing has 70 mentions, and 38 of them are negative, more than half. Complaints include "Very tight in the 'seat area'" and "Too small and tight for the size."
The practical advice is simple. If you sit between sizes, go up. If you have big thighs or a big seat, go up. The elastic waist and the drawstring will take in a little extra at the waist, but nothing will add room at the seat. One buyer who sized up for her husband says the result was "Very light weight and dry fast," with no complaints about fit.
Length is easier to translate. The listing says it hits the knee, and the photos show it ending at or just above the kneecap on the model. On a tall man it ends higher up the thigh, and on a short man it can cover the knee. One buyer, buying for a 14-year-old, counts getting his approval as "a win", which tells you the length is not dated.
Care and how it holds up
No care instructions appear on this trunk's listing. The sibling zipper trunk, made from the same 92/8 blend, says machine wash or hand wash, which is a reasonable guide.
Buyers mostly report good durability. One has worn them "numerous time at the lake and in the pool as well as salt water" and says they still look new. Another says they washed well. The complaints are about thinness. "Very thin, cheap material," says one, adding that he has T-shirts heavier than these. Another says the inside "already ripped apart" after one wear, which likely means the mesh lining. Material, as a theme, is 24 positive and 6 negative.
That thinness is the trade-off for drying time. Every one of the 34 buyers who mention drying time is positive. A thick board short feels more substantial and takes an hour to dry. A thin trunk feels flimsy in the hand and is dry by the time you have finished lunch. Decide which you would rather have.
What buyers say
I have worn it numerous time at the lake and in the pool as well as salt water. Still looks like new.Amazon buyer
Seventy-four percent of 3,321 ratings are five stars, and only 5% are one or two stars. That is a strong record for a trunk at this price. The low ratings are explained almost entirely by sizing. Quality is praised in 153 of 171 mentions, appearance in 68 of 69 and value for money in 54 of 61. Many of the excerpts are written by women buying for husbands and sons, which says something about who orders swim trunks.
Topic counts as Amazon groups them on the product page, read November 14, 2026.
BOJIN lists this trunk on its own site as well.
BOJIN swim trunks with zipper pockets
BOJIN Men's Swim Trunks with Zipper Pockets
$23.99at our last price check
What changes from the 9-inch trunk
This is the same basic trunk with one improvement. The side pockets close with zippers, and the first bullet says that lets you "securely store valuables such as your phone, keys, and cards while swimming." The fabric is the same 92% polyester and 8% elastane. The inseam is the same 9 inches, described as knee-length, and the waist is again elastic with a drawstring. The lining is mesh. Sizes run from S to 5XL.
There are a few small differences in the detail table. It calls the stretch "Medium Stretch", where the 9-inch trunk's table says "High Stretch", and it calls the style a board short with a regular rise. It also states care, which the other trunk does not: "Machine Wash or Hand Wash". We only have one photo of this trunk, in dark blue with red stripes, so we can't show you the zippers up close.
Zippered pockets matter if you actually carry things in the water: a car key on a boat, a hotel key card at a water park. On a trunk with mesh pockets and no closure, those things fall out when you sit or dive. Do keep expectations realistic. A zipper keeps a key in the pocket, it does not keep a phone dry, and nothing in the listing claims the pockets are waterproof. One buyer confirms they drain: "Does dry quickly and pockets drain."
Fit and sizing
The listing gives the same S to 5XL range. The buyer evidence is thinner here, with 16 fit mentions, 14 of them positive. The most useful report comes from a buyer shopping for her son: "He is 6 ft. and wears 34 / 34 so I got a large. The length is great and the fit in the waste is perfect." A 34-inch waist in a large, on a 6-foot frame, with a 9-inch inseam that she calls great, is a good anchor point. One buyer returned a pair "due to fit" without saying in which direction.
If the 9-inch trunk's tendency to run small applies here too, and the fabric and cut are close enough that it may, the same advice holds. Between sizes, go up.
What buyers say
Bought these for my son and they fit great. He is 6 ft. and wears 34 / 34 so I got a large. The length is great and the fit in the waste is perfect.Amazon buyer
Eighty percent of 102 ratings are five stars, and 5% are one or two stars, close to the 9-inch trunk's profile. The sample is a thirtieth the size, so treat the slightly higher 4.6 average as a tie, not a win. Buyers praise the price and quality: "Good quality bathing suit at a very good price."
Topic counts as Amazon groups them on the product page, read November 14, 2026.
The zipper trunk has its own page on BOJIN's site.
BOJIN swim trunks with compression liner
BOJIN Men's Swim Trunks with Compression Liner
$9.99at our last price check
Design and construction
This is a different kind of trunk. It is shorter, with a 5.5-inch inseam according to Amazon's item highlight, and instead of a loose mesh brief it has a built-in compression liner, a stretchy short that sits close to the skin under the outer trunk. The bullets say the liner "offers a supportive fit" and is meant to reduce chafing and to stop the outer layer clinging when wet. That is how the brand describes it. A liner like this works the way bike shorts under running shorts do: it keeps fabric from rubbing between the thighs.
The outer fabric and the liner are both listed as 92% polyester and 8% elastane, with "Medium Stretch" in the detail table. The photos show the liner peeking out below the hem in some colorways, in black, coral or yellow, so it becomes part of the look.
Pockets are the best on any of these three trunks. The bullets list four: two side zipper pockets, one back pocket with a hook-and-loop flap and a drainage grommet, and an inner pocket on the compression liner itself. That inner pocket is a good place for a key, because it sits against your thigh under two layers of fabric.
Who is this trunk for? The occasions bullet lists surfing, running and fitness alongside the pool, and that tells you the thinking. A compression liner suits men who move a lot in their trunks: a beach run before breakfast, a game of volleyball, a long day paddling. It suits less well the man who mostly sits by the pool, for whom a loose mesh brief is cooler and easier to pull on and off. The liner also doubles as underwear on a day trip, so you don't need to change after a swim if you are driving home.
| Trunk | Inseam | Lining | Pockets | Sizes |
|---|---|---|---|---|
| 9-inch quick-dry | 9 in | Mesh brief | 2 mesh side, 1 back flap with drain hole | S to 5XL |
| Zipper pockets | 9 in | Mesh | Zippered side pockets | S to 5XL |
| Compression liner | 5.5 in | Compression short | 2 zip side, 1 back flap with grommet, 1 inside liner | S to XXXL |
Fit and sizing
A 5.5-inch inseam is a short trunk. On most men it ends around mid-thigh, several inches above the knee, which is the look many younger swimmers prefer and a big change if you are used to a 9-inch board short. With the liner underneath, the short length does not mean less coverage: the liner covers the upper thigh even when the outer trunk rides up.
The size range stops at XXXL, two sizes short of the 9-inch trunks. Amazon's detail table rates fit-to-size sentiment as "Positive". The listing gives no waist ranges in its text. A compression liner fits snugly by design, so if you are between sizes, think about your thighs as well as your waist. A tight liner across big thighs is less comfortable than a slightly loose one.
Sun and care
Amazon's detail table lists the fabric's UV rating as UPF 30, lower than the UPF 50+ the 9-inch trunk claims. UPF 30 means the fabric lets through about one thirtieth of UV, and as always it covers only the skin under it. The listing gives no care instructions. The same 92/8 blend appears on the zipper trunk with a machine or hand wash label.
What buyers say
This trunk shows 4.6 stars from 88 ratings, with 80% five stars and 5% at one or two stars. That is a promising start, but there is no buyer text on the listing for us to read, no excerpts and no topic counts. We can't tell you whether it runs small like the 9-inch trunk, or how the liner holds up in salt water. If you buy it, buy it for the design and the four pockets, and expect to judge the fit yourself.
BOJIN lists the liner trunk on its own site.
BOJIN long-sleeve UV rash guard
BOJIN Long-Sleeve UV Rash Guard
$5.99at our last price check
Design and fabric
The rash guard is the cheapest piece here by a wide margin. It is a fitted, long-sleeve crew-neck top in 88% polyester and 12% spandex, a stretchier blend than the trunks. BOJIN calls it a fishing shirt and a running shirt as well as a swim shirt, and the photos show it in solid and gradient colors, not just swim prints.
Three details stand out in the bullets. The sleeves are raglan, meaning the seam runs from the collar to the underarm instead of around the shoulder, which gives more room to lift your arms for paddling or casting. There are thumb holes at the cuffs, so the sleeves stay down over the back of your hands. And the neckline is tagless, which matters on a shirt you wear wet against your neck for hours.
The bullets say the fabric is UPF 50+. That means it lets through less than one fiftieth of the sun's UV, and it protects the skin it covers: your arms, shoulders, back and chest, the parts of a man most likely to burn on a boat. Your neck, face and hands outside the thumb holes are still exposed.
Fit and sizing
Sizes run from S to 3XL. The detail table calls the fit "Fitted" and the fit-to-size sentiment "true to size". It also gives one measurement, a shoulder-to-hem length of 75 centimeters, which is about 29.5 inches. On most men that length reaches the hips and covers the waistband of a pair of trunks, so a gap of bare skin does not open at the small of your back when you bend over.
A fitted rash guard is meant to sit close to the body, without loose fabric to flap when wet. If you want a looser sun shirt for walking around, go a size up. If you want it to sit flat under a life jacket or a wetsuit, stay true to size.
The colors help with pairing. Solid gradients in orange, light blue and purple and a pair of striped designs give you something that goes with a printed trunk without fighting it. A plain rash guard over a busy shark-print trunk is the safe combination. A striped shirt over striped trunks is a lot of stripes. If you are buying both from BOJIN, pick the busier pattern for one of the two, not both.
Care and what buyers say
Care is the most forgiving in this group: hand wash or machine wash, says the detail table.
Ratings stand at 4.7 from 40 buyers, 82% five stars and no one- or two-star ratings at all. Fifteen percent are three stars. With only 40 ratings and no buyer text on the listing to explain those three-star ratings, the sample is small, and we can't tell you what the middle-rated buyers found lacking. At this price, the risk is low.
BOJIN also lists the rash guard on its own site under its swimwear.
The four BOJIN pieces side by side
Put the four listings together and the family resemblance is plain. All three trunks share one fabric, 92% polyester and 8% elastane. Two of them share a 9-inch inseam and a size range up to 5XL. The liner trunk is the odd one out on length and sizes, and the rash guard on fabric. Only two of the four state care instructions, and they say the same thing: machine or hand wash.
How they compare
Prices, ratings and monthly purchase counts as shown on Amazon search results on November 14, 2026. Highlighted rows are the products reviewed here.
These rows come from an Amazon search for men's quick-dry swim trunks with a liner. Amazon Essentials shows 4.6 stars from 27,356 ratings, the deepest record in the table. A trunk titled "Men's Swim Trunks Quick Dry Beach Shorts with Zipper Pockets and Mesh Lining" shows 4.5 from 14,201 with 300+ bought. SILKWORLD shows 4.5 from 5,001 with 700+ bought, and ELETOP 4.6 from 4,707, also 700+. Srnede shows 4.5 from 3,335, Yufawow 4.6 from 881 with 300+ bought, and COOFANDY 4.4 from 816. A 2-in-1 compression-liner trunk shows 4.6 from 858, and a 3-pack of 7-inch liner trunks shows 4.7 from 81.
One row deserves a closer look. A listing in the table carries exactly the same title as BOJIN's 9-inch trunk, "Mens Swim Trunks 9" Quick Dry Stretch Swim Shorts Mesh Lining Bathing Suits Swimwear Beach Shorts with Pockets", and exactly the same 3,321 ratings at 4.5 stars. Same title and same rating count usually mean the same product family sold under another listing. If the print you want is cheaper there, it is worth comparing.
What the table means for you: BOJIN's 9-inch trunk is level with the field on stars and has more ratings than most rows, though Amazon Essentials and the 14,201-rating zipper trunk have far more. Its liner trunk matches the 2-in-1 rival on stars with a tenth of the ratings. We can't say anything about the competitors beyond their titles and numbers. BOJIN's case is price and a wide size range, not a decisive rating lead.
Buying for a family trip
A lot of these trunks are bought in batches. The excerpts are full of people ordering for a husband, a son, a 73-year-old husband, a strongman and a teenager in the same week. If that is you, there are three things worth knowing.
First, the size spread is wide. Between them, the two 9-inch trunks run from S to 5XL, so one brand can cover a slim teenager and a big father without anyone getting a different style. The liner trunk stops at XXXL, and the rash guard at 3XL, so check the largest person in the group before you settle on those.
Second, order a second size for anyone who sits between two. A trunk at $19.99 is cheap enough that keeping the spare and returning the other is easier than an exchange a day before you fly. That matters more here than with most swim brands, because the sizing theme on the 9-inch listing has more complaints than praise.
Third, think about who needs sun cover. The rash guard is sized for adults, S to 3XL, so it is for the grown-ups in the group, and it covers the arms, shoulders and back that burn first on a boat or a long afternoon in the water. At $5.99 it is an easy addition to the order. You still need sunscreen for your face, neck and hands.
Which BOJIN piece for whom
| If you want | Pick | Why |
|---|---|---|
| One reliable trunk for a beach week | 9-inch quick-dry trunk | 3,321 ratings, 74% five stars, dries fast |
| A key or card that stays put in the water | Zipper-pocket trunk | Zippered side pockets, same 9-inch length |
| A shorter, modern length with support | Compression-liner trunk | 5.5-inch inseam, liner, four pockets |
| Sun cover on a boat or a fishing trip | Rash guard | UPF 50+, thumb holes, 29.5-inch body length |
| Trunks for a big man | 9-inch or zipper trunk | Sizes to 5XL; size up |
| Hard evidence before you buy | 9-inch quick-dry trunk | The only one with thousands of ratings |
Buying for a woman on the same trip? Our review of BMJL's sporty bikini, cover-up and swim shorts covers four pieces at similar prices, and the rest of our swim coverage is in the swim section.
Who should buy, who should skip
Buy the 9-inch trunk if you want the safest bet: a knee-length trunk that dries fast, a print you like and a deep buyer record, ordered one size up if you are at all in doubt. Buy the zipper version if you carry a key or a card into the water. Buy the liner trunk if you prefer a shorter length and a fitted liner to a loose mesh brief, and you are comfortable going on stars alone. Buy the rash guard if you burn on boats, paddleboards or fishing trips, and want long-sleeve UPF 50+ cover for almost nothing.
Skip all three trunks if you want a heavy, structured board short. Buyers who dislike the 9-inch trunk most often call the fabric thin. Skip the liner trunk if you are above an XXXL. And skip the 9-inch trunk if you are certain of your size and don't want to gamble on a chart that more buyers find small than true.
Verdict
We recommend BOJIN's 9-inch quick-dry swim trunk for most men, ordered a size up from your usual pants size if you are between sizes or broad in the seat. Its 3,321 ratings, fast drying and wide size range outweigh a fabric some buyers find thin. We recommend the zipper-pocket version as the better choice if you carry valuables. The compression-liner trunk and the UPF 50+ rash guard are good value on paper and on stars, and we would buy the rash guard at its price without hesitation, but neither has buyer text yet. We don't recommend these if you want a substantial, heavy board short that feels built to last for years.
Buy the 9-inch trunk a size up, or the zipper version
BOJIN's 9-inch mesh-lined trunk has the strongest record here, 4.5 stars from 3,321 buyers, and its one real problem is a size chart that more buyers call small than true. The zipper-pocket version fixes the only pocket complaint you could have. The liner trunk and the rash guard look good on paper and on stars, but neither has any buyer text yet.
- 9-inch trunk has 3,321 ratings and 74% five stars
- Every buyer who mentions drying time is positive
- Sizes run to 5XL on both 9-inch trunks
- Rash guard states UPF 50+ and has thumb holes, at a very low price
- More buyers call the 9-inch trunk's sizing wrong than right
- Several buyers find the fabric very thin
- Liner trunk and rash guard have no buyer text to read
- No care instructions on the 9-inch or liner trunks
Best for: Men who want an inexpensive, knee-length trunk that dries fast, and families buying several pairs for one vacation.
Skip it if: You want a thick, structured board short, or you hate exchanging for a bigger size.
Where the numbers come from. Prices, star ratings, rating counts and monthly purchase badges were read from the product pages on November 14, 2026; they move daily. Fabric, sizing and dimensions come from the product specifications. Buyer quotes are Amazon reviews as the product page shows them, linked to the full review where Amazon gives one. See how we review.
