Boardshorts Versus Swim Trunks: What to Wear

The call between boardshorts versus swim trunks is usually made before you even hit the water. Are you paddling out at first light, swimming between flags, chasing the kids along the shoreline, or parking up at the local for a long summer arvo? Both belong in a coastal kit. They just do different jobs.

The right pair should feel like part of the day, not something you are constantly adjusting, drying, or wishing you had left at home. Here is how to choose based on movement, comfort and the kind of saltwater life you lead.

Boardshorts versus swim trunks: the real difference

Boardshorts are built with board sports in mind. They are generally longer in the leg, sit at or just above the knee, and use a fixed waistband with a lace-up closure. Most are made without a built-in mesh liner, giving surfers and active ocean-goers more room to move without extra fabric bunching underneath.

Swim trunks are the familiar, shorter swim short. They often have an elastic waistband, drawcord and mesh lining, plus side pockets. They are designed for easy swimming, pool sessions and relaxed beach days rather than long stretches on a board.

Neither is automatically better. The difference is in the cut, the waistband and how each pair behaves once you are wet, sandy and moving around.

When boardshorts earn their place

If surfing is on the plan, boardshorts make sense. Their longer cut offers more coverage as you pop up, squat low and paddle. A secure waist is a big deal too. In a decent wipeout, you want your shorts staying where they belong.

Quality boardshorts tend to use lightweight, quick-drying fabric with some stretch. That stretch matters more than people think. Surfing asks a lot from your hips and legs, from the first paddle-out to the walk back up the beach. Stiff fabric can rub, pull and make every movement feel restricted.

The lack of a mesh liner is another reason many surfers prefer them. Mesh can hold sand, chafe after a long session and feel bulky under a wetsuit. Boardshorts are simpler by design: one dependable outer layer that moves with you.

They also work well beyond the lineup. Throw on a tee after a surf, grab a coffee, load the boards onto the roof racks and keep rolling. The longer, cleaner silhouette has become part of coastal everyday wear for good reason.

The trade-off with longer shorts

More coverage is not always more comfortable. Boardshorts can feel like overkill for a quick dip or laps at the pool, especially if they are long, heavy or cut too loose. Their fixed waist also means fit matters. Get the size wrong and no amount of tightening the drawcord will make them feel right.

For bodyboarding, stand-up paddleboarding, beach runs and surf sessions, that trade-off is usually worth it. For floating about in calm water, maybe not.

When swim trunks are the better call

Swim trunks are made for low-fuss water time. Their elastic waist is easy to pull on, their shorter inseam keeps fabric out of the way, and their liner provides support when you are swimming rather than standing on a board.

They suit the beach day that has no strict plan. One minute you are in the water, the next you are walking the headland, kicking a footy on the sand or heading into town for fish and chips. A good pair feels casual without looking sloppy.

For lap swimming, swim trunks can be more practical than boardshorts. Less fabric means less drag and less water weight. They are also often easier to share a wash bag with on a weekend away, since they pack down small and dry quickly in the sun.

The shorter length gives them a more relaxed, classic swimwear look. If you prefer showing a bit more leg or do not want wet fabric catching behind your knees, trunks are likely the more comfortable option.

The trade-off with mesh lining

The built-in liner is useful for some and annoying for others. It gives swim trunks shape and support, but it can also trap sand and cause rubbing if you stay in them all day. This comes down to personal preference and where you wear them.

For a short swim, the liner rarely causes trouble. For hours of paddling, sitting on wax or walking in wet shorts, it can become the thing you notice most. If you are prone to chafing, choose a soft liner, check the seams, and never ignore a fit issue in the change room.

Fit matters more than the label

A pair of boardshorts that slips at the waist will ruin a surf. Swim trunks with a tight liner will ruin a beach day. Before choosing a style, pay attention to fit through the waist, seat and thigh.

Boardshorts should sit securely without needing to be cranked tight. You need enough room to bend, paddle and pop up, but not so much that the fabric balloons in the water. Look for a waistband that stays flat against your body and a drawcord that actually holds.

Swim trunks should feel easy through the leg, not clingy or restrictive. The elastic waist should hold them up comfortably, while the liner should support without digging in. Try squatting, lifting a knee and sitting down. It sounds basic, but those movements reveal a lot.

Length is personal, but activity gives you a useful starting point. A mid-thigh trunk suits swimming and warm-weather lounging. A boardshort around knee length suits surfing and broader coverage. If you sit between the two, a shorter boardshort is often the sweet spot: active enough for a surf, easy enough for the rest of the day.

Fabric, pockets and small details that count

The best swim shorts are not just about the print. Fabric changes how a pair performs once it is soaked, sandy and sun-baked. Look for material that dries fast, has enough stretch for your movement and does not feel rough against the skin. Flat or minimal seams are a bonus when you are spending hours in saltwater.

Pockets need a little thought. Boardshort pockets are handy for a wax comb or a key, but anything loose in a pocket can become a nuisance in the surf. A secure zip or flap pocket is useful if you need to carry a small essential on the walk to the beach. For swimming, empty pockets are usually the best pockets.

Colour and pattern are the fun part, but they have a practical side too. Darker shades tend to hide wax marks and wear, while lighter colours can feel cooler under harsh summer sun. A print that still looks good after repeated saltwater sessions is worth more than a trend that feels dated by Boxing Day.

Choose for the day you actually have

You do not need to swear allegiance to one style. Plenty of ocean people keep both in rotation. Boardshorts cover surf checks, reef walks, boat days and sessions where movement matters. Swim trunks handle pool swims, calm beach days, travel and any plan where comfort is the whole point.

If you are buying one pair first, be honest about your routine. Someone learning to surf will get more use from flexible, secure boardshorts. Someone who swims, holidays by the coast and wants one easy summer staple may get more value from trunks. The answer is not about looking more surf-ready. It is about wearing gear that lets you stay in the water longer.

Salt Born is built around that simple idea: gear should belong to the ocean, not get in the way of it. Choose the cut that matches how you move, rinse it after every salty session, and keep a dry pair in the ute for whatever the coastline throws up next.