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Fiti Swimming Jammers

Sale price: $34.99 Regular price:

Fancy a swimsuit that makes all the difference?NABAIJI's latest creation, the 500 FITI swimming jammers, provide the best support, are chlorine-resistant and are perfect for your training sessions.

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This product runs small

Sale price: $34.99 Regular price:

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San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8615432

Product Videos

Product Features

A photo of the Fiti Swimming Jammers in use

Fiti Swimming Jammers | Our design teams developed these modern swimming jammers for intermediate swimmers wanting to improve their technique and their physique.

Fancy a swimsuit that makes all the difference?NABAIJI's latest creation, the 500 FITI swimming jammers, provide the best support, are chlorine-resistant and are perfect for your training sessions.

Chlorine resistant

Benefit from AQUARESIST components for over 200 hrs in chlorinated water.


Benefit from excellent support thanks to the elastane-free elastic fabric.


Adjust them easily at your waist thanks to the drawstring with no end pieces.

Product Customer Reviews

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1079 Reviews
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Fiti Swimming Jammers,black
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Totally not sure about the sizing

Fabric seems good quality. My last pair of Nabaiji jammers were size M. These are size L (but labelled as size 42 FR). They're much smaller when placed up against my old size M pair (which are admittedly another style and which have almost certainly become looser with age). I knew from other reviews that the legs on these ones might be tight so I expected that but these seem much smaller in every dimension. Maybe it's just a matter of a much tighter fit. I find the sizing confusing and I wish Decathlon would adopt a more consistent approach.

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Great Product

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Nabaji swimming jammers

I have been using all my stuff and gears from decathlon. No looking back.

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overall pretty good

size is a bit smaller despite the measurement.

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Hi Mark,

Thank you for sharing your feedback about these swimming shorts. We always recommend sizing up on clothing purchased from Decathlon. Hope this helps for the next time you're in store! :)

Seimming Jammer

Fit perfectly

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Hi Dina,

Thank you for sharing in depth details about these swimming shorts. Your feedback will assist other customers when they are looking to make a purchase themselves! Thanks for sharing! :)

Good swimsuit, but North American sizing far off

I would not recommended buying these online because the Canadian- American sizing is very far off the mark. You will want to try on in store. I would expect to fit a CA large or extra large based on the website's sizing guide (though I take medium in many brands), and I ended up buying a 2XL. Otherwise, seems to be a great suit. I am swimming 3.5 km weekly in it. Just don't trust the sizing.

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Hi John,

Thank you for your review!

We are glad you are satisfied with your product. Regarding the sizing, you are absolutely right, and rest assured that we have a team dedicated to adapt our sizing to North America. In most of our products, we recommend to go for a size up. For swimsuit, two size up might be a good idea, as you suggest, also depending on the fit needed.

Again, thank you for your review that will help our customer choose their swimsuit.

Have a great day,

Marie 🏊‍♀️

Décathlon Canada

Good Product

Good product at a good price. Not sure why I'm seeing Chinese (Taiwan) text for question 2 instead of English??

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Great product

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Quick and efficient delivery

Size is accurate - my son is very happy with them

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Nice fit.

Perfect fit and style for my teenage boy.

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Watch Out for the SIZING!

Only after I got home did I realize the "Size 44" was FRENCH sizing... and so too small for me. SO my 10c of advice is - always check the sizing label carefully So haven't used it - and haven't had a chance yet to go back and replace it.

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Too Many Labels

The care labels sewn inside are long and uncomfortable. They should be sewn so that they are easily removable. The leg openings seem alittle tight based on the waist proportions.

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Good product

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Good Product

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Additional Product Information


Main fabric: 100.0% Polyethylene Terephtalate ; Main lining: 100.0% Polyamide ; Yoke: 86.0% Polyethylene Terephtalate, 14.0% Spandex

Swimming jammers style

SWIMMING JAMMERS – 44 cm longThese JAMMERS are ideal for anyone who wants to surpass themselves. A swimsuit should primarily favour comfort. It should enable you to move with ease. That is why it is important to choose the shape of your swimwear carefully.


Our engineers have developed a Polyester-based textile and replaced the elastane fibres with PBT fibres that give them sufficient elasticity to ensure user comfort whilst 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.- even the brightest of colours will retain their colour-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.

Score to compare the environmental impact of products

The environmental impact of the product is calculated over its entire life cycle using different indicators. An ABCDE score is provided to enable easy identification of the most environmentally-friendly products when comparing products of the same type (T-shirts, trousers, backpacks).Decathlon chose to apply this voluntary environmental labelling scheme.Web: sustainability.decathlon.comVideo:

Product testing

The products labelled 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, the product remains intact.

Storage instructions

Store the swim boxers in a dry place.



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