Product Colors and Sizes
- Black Friday product
- New Deal product
- Cyber Monday product
- Clearance product
- Deal product
- Best Seller product
- Ecodesign product
- New product
- Staff Pick product
- In The News product
- Innovation product
- product
- Black Friday product
- New Deal product
- Cyber Monday product
- Clearance product
- Deal product
- Best Seller product
- Ecodesign product
- New product
- Staff Pick product
- In The News product
- Innovation product
- product
900 B-Fast Swimming Trunks Men's
Men's trunk-style swimwear, designed using the best fabric to ensure excellent chlorine-resistance and optimal comfort.
Free shipping over $49
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.
Product Videos
Product Features

Chlorine resistant
more than 200 hours of use: recommended for regular use.
Stability
Swim trunks provide good support
Adjustable
Easy to adjust around waist using drawstring and a special silicon toggle.
Product Lifestyle Image Gallery
Image Gallery





Questions & Answers
There are no questions
Be the first to post a question
Product Customer Reviews

Regulin....
Perfect
Total satisfaction.
no choice in model
It's a good swimsuit but they are too small and too tight.
Bought wrong size... supposed XXL.. frustrated
the 2 swimsuits I bought fit me well and are pleasant to wear
I bought the same costume for the second time because I like it so much+
I had to take 2 sizes larger than my usual size.
Basic jersey
Ideal for the swimming pool. Very good support
Convenient and comfortable
Good in the pool or at sea
.
Ras
Size Guide

Additional Product Information
Composition
Main fabric: 78.0% Polyester, 22.0% Elastolefin ; Lining: 100.0% Polyamide
Style
Swimming trunks – side height 3.1”Swimwear should prioritize comfort. It should enable you to move with ease. That is why it is important to choose the shape of your swimwear carefully.The swimming trunks have a classic and timeless cut, providing great freedom of movement, as well as plenty of support.Details are positioned so that they mold to your body shape.
Material
22%- Elastolefin 78% - PolyesterOur engineers have developed a polyester-based fabric and replaced the spandex fibers with fibers that give it sufficient elasticity to ensure user comfort while protecting it against the damaging effects of chlorine. This thread also offers the following benefits:- quick drying. - only loses 3 to 4% resistance throughout its lifespan.- UV-resistance: Colors are more stable.
Aquaresist technology
Products bearing the AQUARESIST label are guaranteed to deliver chlorine-resistance throughout their lifespan. They will keep their elasticity and be resistant to light. For these reasons, they are recommended for regular or intensive pool use.
Determining the environmental impact of our products
The environmental impact of the product is calculated over its entire lifecycle 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, pants, backpacks).Decathlon chose to apply this voluntary environmental labeling system.Web: Sustainability.decathlon.comVideo: https://youtu.be/8t63KkRwn_8
Product testing
Products labeled with AQUARESIST certification are tested under repeated cyclical loading in a pool of chlorinated water for more than 200 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 shorts in a dry place.
Guarantee
2
Origin
Imported
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
-
Research and development
delivers high-quality cost-effective products
-
State-of-the-art production processes
minimize manufacturing costs
-
Optimized supply chain
reduces retail prices
-
Minimal retail footprint
lowers overhead and indirect costs

900 B-Fast Swimming Trunks Men's
Your location: City, ST
Please enter a valid city with state or zipcode. Example: San Francisco, CA or 94101
Order online for
Heavy products return policy
If you return a product you will receive a refund for the purchase price plus any applicable sales taxes, less any non-refundable charges.
Decathlon will cover all shipping costs associated with your return except for items excluded from our return policy such as bikes, basketball hoops, snowboards, surfboards, tents, and other larger / heavier items.
Return costs for heavy products:
Weight Thresholds | Shipping within California | Shipping outside of California |
---|---|---|
> 9 lbs | $20.00 | $25.00 |
> 30 lbs | $50.00 | $65.00 |
> 100 lbs | $100.00 | $125.00 |
> 200 lbs | $200.00 | $230.00 |
If you return a product at any of our store locations, we will gladly help you find the best alternative product or refund you on the spot.
