Men's Swim Briefs

What Is a Swim Brief

A swim brief is the traditional swimsuit cut for men. It sits at the hip, leaves the leg free and reduces drag in the water, which is why competitive swimmers and pool regulars choose this style of swimwear over longer cuts. Mariner Underwear makes these men's swim briefs in a polyamide and elastane blend that stretches with every stroke.

Fabric and Performance

The outer fabric is 80% polyamide and 20% elastane. Polyamide dries fast for quick comfort after a swim. The elastic content gives stretch that lets you move without restriction. A 100% polyester lining sits inside for added comfort and support. An interior drawstring adjusts the waist fit without external hardware, so nothing chafes during a long swim. A small logo sits at the side. The fabric is soft against skin and practical for pool use.

Colours and Designs

The collection runs three bold designs. Two solid colour swimwear styles come in navy blue and indigo blue. A third option uses a geometric navy and white print that works equally well on the beach or at the pool. All three share the same snug-fit construction and performance fabric. The blue tones are popular for lap swimming, beach days and holiday trips.

Sizes and Price

Sizes run M, L and XL. Take your usual size. The drawstring gives a secondary adjustment at the waist. Check the current price and available selection on the product pages above. Buy direct for accurate stock and sizing information.

Swim Briefs vs Swim Shorts vs Swimming Trunks

Men's swim briefs, swimming trunks and swim shorts are swimwear options at different leg lengths. Swim briefs sit at the upper thigh, the most compact cut in the range. Swimming trunks reach mid-thigh with a close fit made from similar stretch fabric. Men's swim shorts are the longest of the three, a mid-length style with a mesh lining, pockets and a cord waistband. For lap swimming, a brief or trunk creates less drag. For beach or holiday use, a longer swim short gives more comfort when sitting and moving around.

Pool and Beach Care

The quick-dry polyamide fabric works in fresh and salt water. Rinse the swim brief after each swim to remove chlorine or salt, then hang to dry. Avoid machine drying, which can damage the elastic over time. Wash at 30 degrees without fabric softener. Treated properly, the brief stays comfortable for regular pool use.

How to Choose Your Size

The fit should feel snug without cutting in. Polyamide and elastane have enough stretch that sizing up rarely improves comfort and often reduces support. If you are between sizes, take the smaller. The drawstring gives secondary adjustment at the waist.

About the Brand

Mariner Underwear has made men's underwear and swimwear since 1967. The brand's men's swim briefs use the same polyamide and elastane fabric as the rest of the swimwear range. Shop the full men's swimwear range, which also includes men's swim shorts and men's swimming trunks for men who prefer a longer cut.

Frequently Asked Questions

Should guys wear swim briefs?

Swim briefs are a practical choice for pool swimming. The close fit reduces drag in the water and the quick-dry fabric means you are not sitting in wet fabric long after you leave the pool. For the beach or a casual holiday, some men prefer a longer cut like swim shorts or swimming trunks. It comes down to personal preference and how you plan to use them.

What are male swim briefs called?

Men's swim briefs are sometimes called racing briefs, speedos (after the brand), or simply swimming briefs. In the UK, the terms swim brief and swimming brief are most common. They differ from swim shorts, which are longer and looser, and from swimming trunks, which are a mid-thigh close-fitting cut.

What material are men's swim briefs made from?

Most men's swim briefs use polyamide and elastane, the same combination as Mariner Underwear's collection. Polyamide dries quickly. Elastane gives the stretch that makes close-fitting swimwear comfortable in the water. A polyester lining adds support and comfort.

How do I wash men's swim briefs?

Rinse in cool water after each swim to remove chlorine or salt. Machine wash at 30 degrees without fabric softener, which degrades elastane over time. Air dry flat or hanging. Avoid tumble drying, which shortens the life of the stretch fabric.

What sizes do Mariner Underwear men's swim briefs come in?

The swim briefs are available in M, L and XL. The fit is close to the body, so take your usual size. The interior drawstring allows some adjustment at the waist.

What is the difference between swim briefs and swimming trunks?

Swim briefs sit at the upper thigh and are the most compact cut. Swimming trunks are longer, reaching mid-thigh, and usually have a closer fit than swim shorts. Swim shorts are longer still, typically with pockets and a mesh lining. Mariner Underwear sells all three styles.

What do guys wear under swimsuits?

Most men's swim briefs and swim shorts have a built-in mesh or fabric lining, so nothing is needed underneath. Mariner Underwear swim briefs include a polyester lining that provides support and coverage.