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Men's Boxer Swim Shorts AQUARESIST B-Fit

Sale price: $5.00 Regular price: $16.99

Men's boxer-style swim shorts, perfect for regular swimming in a pool or outdoors thanks to their excellent chlorine resistance.

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Size: Select a size
Size Guide

This product runs small

Sale price: $5.00 Regular price: $16.99

Free shipping over $35

Final Sale: No returns or exchanges

Free returns

Free pickup

San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8359140

Product Videos

Product Features

A photo of the Men's Boxer Swim Shorts AQUARESIST B-Fit in use

Men's Boxer Swim Shorts AQUARESIST B-Fit | Regular swimmers training at least once a week.

Men's boxer-style swim shorts, perfect for regular swimming in a pool or outdoors thanks to their excellent chlorine resistance.

Chlorine resistant

more than 200 hours of use: recommended for regular use.


Easy to adjust fitting around waist thanks to the drawstring.

Freedom of movement

The fabric lies flat against the skin and allows legs to move freely.


The material ensures a good fit and good support

Product Lifestyle Image Gallery

Image Gallery

Men's Boxer Swim Shorts AQUARESIST B-Fit,black 

Men's Boxer Swim Shorts AQUARESIST B-Fit,black

Product Customer Reviews

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Men's Boxer Swim Shorts AQUARESIST B-Fit,black
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These are cool



Reasonably good pair of shorts however they have a tendency to ride up the legs.

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never large!!

No way are these large! states they are large size 36?? more like a 30 when stretched .. regarding would I recommend these, hard to say material looks ok maybe a little thin. However these are swim shorts but they are a little thinner than my old swim shorts. But way way to small

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Fit well. Fair price what more could anyone ask.

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Very small.

Ordered these swim trunks for my husband in his usual size 32. I shall be returning them as they are ridiculously small. Think they are more like a boys item.

Dear J Waite,

Thank you for your recent feedback. We are sorry to hear that you found our men's swimwear well to small. This model is for regular swimmers which practiced few days a week. These boxers are made with special aqua resist fabric to last longer and the shape is design to give good support and aerodynamic. In dry condition they may create filling of too small but after when you get to into water they should get more flexible. If you are looking for more occasional boxers then I would recommend one of these models: 8331340, 8361310 or 8335897 (the model code to be used in the search bar on
Please return your item to local store or use the online procure for full refund or exchange. 
Once again  apologies for any inconvenience caused.
Kind regards
Sizing did not match other similar products

I bought shorts, running shotts and swimming trunks, all in medium. The shorts and running shorts were a good fit but the swimming trunks were much much smaller

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Dear Ray,

Thank you for your feedback. We are sorry to hear that you find some discrepancies with sizes between Decathlon brands. With the swimwear it is normal that they are much small compare to the standard clothes. The fabric which is usually used to make swimwear expand in the chlorine water and this is why this type of products are really tight. From personal experience as ex professional swimmer I use L or XL board shorts but M or M/L swimwear (boxers or jammers).
If you still feel that the size of boxers is too small for you then please return this item your local store or use the online procedure for full refund or exchange.
Once again apologies for any inconvenience caused. 
Kind regards,

Swim shorts

Good size and good quality product

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Stylish and economical Swimwear

The fit was perfect and the style very pleasing .The material is water resistant and perfectly suited for regular long distance swimmers like me.

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Добро качество за цената

Банските са удобни, не стягат, не са отпуснати и връзките са достатъчно дълги за да се вържат удобно.

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Сполучлива покупка!

Банските са от много хубава материя на добра цена!

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Plavky Nabaiji

Plavky splňují všechno co mají.

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Za mě spokojenost s výrobkem. Za nabízenou cenu kvalita.

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Plavky do bazénu

Do bazénu bezva cena i materiál

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Size Guide

Size Guide Visual

Additional Product Information


Main fabric

  • 100% Polyester cationic

Main lining

  • 100% Polyamide


BOXER – length 9.8 in. First and foremost, a swimsuit should be comfortable. It should enable you to move with ease. That's why it is important to choose the cut of your swimwear carefully. Boxer swim shorts are ideal for those who prefer a cut that provides more coverage than briefs.


Our engineers have developed a Polyester-based textile and replaced the spandex fibers with PBT fibers that give it sufficient elasticity to ensure user comfort while protecting it against the damaging effects of chlorine. The benefits of this PBT thread are - quick drying. - only loses 3 to 4% resistance throughout its lifespan. - UV resistant: even the brightest of colors will retain their color fastness.

Aquaresist technology

Products bearing the AQUARESIST label are guaranteed to deliver chlorine resistance throughout their lifespan. They will maintain their elasticity and are UV resistant. For these reasons, they are recommended for regular or intensive pool use.


Swimwear intended for regular use.

Score to compare the environmental impact of products

The environmental impact of the product is calculated over its entire life cycle and with different indicators. An overall score (ABCDE) is attributed to help you easily identify the products with the best environmental performance by comparing products of the same type with one another (T-shirts, pants, backpacks, etc.). Decathlon chose to apply this voluntary environmental labeling system. For more information, visit:



Product testing

The products labeled with AQUARESIST certification are tested under repeated cyclical loading in a pool of chlorinated water for 240 hours. No deterioration of elastic strength was observed throughout the test. Unlike a standard swimming product, this product retains its shape.

Storage instructions

Store the swim shorts in a dry place.

Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

Decathlon makes the difference
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    Research and development

    delivers high-quality cost-effective products

  2. State-of-the-art production processes

    minimize manufacturing costs

  3. Optimized supply chain

    reduces retail prices

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    Minimal retail footprint

    lowers overhead and indirect costs