Beach Shorts vs Board Shorts vs Swim Trunks: What Buyers Actually Specify

Three names, three different garments, and one supply chain that makes all of them. Buyers regularly send an enquiry for “beach shorts” when the reference sample in the attachment is a board short, or approve a swim trunk quote against a beach short specification — and the gap only shows up at inspection. This article separates the three by the points that actually appear on a tech pack: fabric, lining, waistband, fly, length, print and colour-fastness test method.

If you are sourcing any of the three, the practical question is not which name is correct. It is which construction you are buying, at which cost, against which test list.

The three terms, defined for sourcing

• Beach shorts. A retail term for casual woven shorts worn at and around water. Typically mid-length, elastic or part-elastic waist, unlined or lightly lined, in cotton poplin or polyester. Often sold as streetwear as much as swimwear, which is why the fabric choice matters more than the water contact.
• Board shorts. The surfing cut. Longer (usually 20–25 cm inseam on an adult men’s programme), fixed or semi-fixed waistband with a lace or drawcord, a hook-and-loop or short zip fly, quick-dry taslan, frequently a bonded or neoprene gusset, and a leg opening cut to clear the knee under load.
• Swim trunks (swim shorts). The pool cut. Shorter, full elastic waist with an internal drawcord, mesh or soft brief lining, chlorine-resistant fabric and print. The defining requirement is chlorinated-water colour fastness, which the other two rarely need.

Retail naming does not follow these lines consistently. In the US, “swim trunks” and “board shorts” are often sold side by side under the same label; in the EU, “beach shorts” covers both. The only stable definition is the specification.

Beach shorts vs board shorts vs swim trunks: the specification table

The table below is the one worth pasting into a quotation request. Each row is a decision that changes price, and each cell is a value a factory can quote against.

Which fabric does each cut actually need?

Taslan (also written taslon) is a tightly woven nylon or polyester, usually 190T–210T. It dries quickly because the fibre absorbs little water and the dense weave does not hold it, and it accepts sublimation print across seams. It is the default for board shorts and swim trunks, and increasingly used for beach shorts sold as quick-dry.

Peach-finish polyester, commonly 75D, has a brushed, matte hand. It reads as a casual short rather than a swim garment, which is why European beach short programmes use it for product that will be worn on the street as much as on the sand.

Cotton poplin at 130–150 gsm is comfortable in heat and prints beautifully, but it holds water. It belongs on beach shorts and never on swim trunks. If a buyer specifies cotton for a swim programme, the correct response is to challenge the brief, not to quote it.

Recycled polyester is available for all three. The claim becomes defensible only when the mill holds GRS or RCS certification and can issue a transaction certificate for the lot; without that paperwork, “recycled” cannot go on a hangtag.

Which lining does each cut need?

Lining is the single most common omission on a beach shorts enquiry, and it is not a detail.

• Mesh brief liner is the swim standard: fast-drying, cheap, and rough against sensitive skin. It is attached at the waist and at the side seams; attachment at the waist only will tear at the leg after a few wears.
• Soft jersey brief liner costs more and is used where the garment may be worn for longer periods or by children.
• Unlined is correct for beach shorts and for board shorts designed to be worn over swimwear.

State the lining type and the attachment points on the tech pack. A liner that is specified but not attached at the side seam is a defect waiting for a warm day.

Waistband, fly and the load path

The waistband is where the three cuts diverge most visibly, and where a board short earns its price.

Beach shorts normally use a full elastic waist with an external drawcord, sometimes with a flat front panel for a cleaner look. Swim trunks use full elastic with an internal drawcord, so nothing hangs outside the garment. Board shorts use a fixed or semi-fixed waistband with a lace tie threaded through eyelets, plus a hook-and-loop or short zip fly — a construction that has to survive being pulled on wet, which is why the eyelets are bar-tacked and the fly is reinforced.

Under load, the highest-stress points are the crotch seam, the fly corner and the waistband ends. Specify flatlock or four-needle six-thread (ISO 4915 type 607) at the crotch and inner leg where chafe matters, and bar-tack every end. A board short built with a single-needle crotch seam will fail at the seam before the fabric goes.

Which print method fits which fabric?

Sublimation dyes polyester fibre rather than coating it. The print does not crack, and it wraps a seam without a white line — which is why all-over print board shorts and swim trunks are almost always sublimated. It does not work on cotton.

Digital direct-to-fabric handles cotton and blends, and suits short runs where a brand is testing a print before committing to screens. Cost per metre is higher; the minimum is lower.

Rotary screen is the cheapest at volume and the only realistic route for spot-colour programmes above roughly 3,000 metres. Screens are a one-off cost tied to the buyer’s colourway.

Whichever method, the test list decides whether the print survives: wash to ISO 105-C06, perspiration to ISO 105-E04, light to ISO 105-B02, and — for swim trunks — chlorinated water to ISO 105-E03. The last one is the differentiator. A print that passes wash fastness and fails chlorinated water looks correct in the showroom and faded after two pool sessions, and it is one of the most common causes of a failed swimwear shipment.

Can a beach short carry a UPF 50+ claim?

“UPF 50+” on a beach short or board short is a test result, not a design intention. The test method depends on the market: EN 13758-1 in Europe, AS/NZS 4399 in Australia and New Zealand, and AATCC 183 in the United States. Stretch, wetness and wear all reduce the measured value, so a fabric that tests UPF 50 dry and relaxed may not hold that number when wet and stretched — which is the condition the garment is sold for.

If a UPF claim is planned, name the method and the laboratory in the tech pack, and test the finished garment rather than the greige fabric.

How is sizing graded for beach shorts?

Grade from body measurements, not from S/M/L labels. ISO 8559-1 gives the body-measurement definitions to work from; the size breaks themselves are a market decision. European men’s programmes commonly run waist 71–112 cm, US programmes run waist 28–44 inches with a different distribution, and Australian programmes sit closer to the US with a longer inseam.

Two practical points: state the inseam per size break (it often grows with the size), and state the leg opening. A board short that keeps a constant leg opening while the waist grows will look tight on larger sizes.

What actually drives the price of beach shorts?

Minimum order for this line is 3,000 pcs per style per colour, which is set by fabric minimums, screen and print set-up, and the cost of running a cutting table for a colourway.

Three variables move the price more than anything else: print coverage (an all-over sublimation print consumes far more than a chest logo), lining (mesh versus jersey versus none), and hardware (eyelets, drawcord tips, zip, hook-and-loop). Fabric choice moves the price too, but less than buyers expect — the construction around it usually costs more than the fibre.

Which is why quoting one price for “beach shorts” without the four lines above produces a number that is wrong for at least two of the three cuts.

Writing it into the tech pack

The specification that removes ambiguity, in the order a factory reads it:

• Cut name plus a reference photo, and the intended water contact.
• Fabric construction and gsm, with the colour-fastness test list.
• Lining type and attachment points.
• Waistband type, drawcord position, fly type.
• Inseam and leg opening, per size break.
• Print method, placement, repeat size and colour references.
• Label positions: main, care, size, and any custom logo on the waistband.
• Packing: flat or hanger, polybag, carton quantity and carton dimensions.

Five mistakes that cost a shipment

• Quoting “beach shorts” without naming the lining. The price is wrong before the sample is cut.
• Treating chlorine fastness as wash fastness. They are different tests (ISO 105-E03 versus ISO 105-C06) and only one predicts pool performance.
• Specifying UPF without a test method. A number without a method is not a claim you can defend.
• Letting the factory choose the waistband. The waistband is the most visible cost decision on the garment and the hardest to change later.
• Assuming the same price covers all three cuts. Board shorts carry more construction than beach shorts; swim trunks carry more testing than either.

Where Unitex fits

We are Xiamen Unitex Trade Co., Ltd., a sourcing and trading company working with partner manufacturers in China — in the trade since 2009, incorporated in Xiamen in 2013, with partner factories holding amfori BSCI and OEKO-TEX® STANDARD 100 available for the fabrics used.

All three cuts run through the same custom beach shorts programme, which means a buyer can compare them on one quotation instead of three. We quote 3,000 pcs per style per colour, 12–18 days for a development sample, 5–7 days for PPS, and 45–60 days for a first bulk order (30–40 on repeat), FOB Xiamen. If you are weighing which of the three to develop first, send the reference sample and the destination market — the answer usually comes down to which test list the market requires, not which garment looks better.

Published: 2026-10-26 · Xiamen Unitex Trade Co., Ltd. — OEM & ODM underwear sourcing partner

Unitex Underwear (Xiamen Unitex Trade Co., Ltd.) — OEM/ODM underwear sourcing and supply-chain partner in Xiamen, China; in the trade since 2009, incorporated in 2013. Based in the Xiamen–Quanzhou–Jinjiang knitwear cluster, Fujian Province, south-east China.