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Key feature
FINA (International Swimming Federation) approved swimming competition jammers that combine compression, glide and hydrodynamics thanks to AQUARACE technology.
Users reviews
3.74 / 5 23 ratings

Products benefits

AQUARACE technology reduces body drag resistance in water.
Glide performance
Water repellent fabric absorbs virtually no water and guarantees a perfect glide
Muscle support
Excellent muscle compression at the quads and glutes.
The B-FAST JAMMER's component is ultra thin and lightweight 155 g/m2


From EU size 36 to 46
Main fabric : 53.0% Polyamide, Main fabric : 47.0% Elasthane Lining : 77.0% Polyamide, Lining : 23.0% Elasthane
Designed to
competitive swimmers. Developed with Fabien Gilot, Olympic Champion and NABAIJI technical partner.
2 years


Storage Tips
Store the swim shorts in a dry place.


JAMMER – length 44 cm The Jammer provides great muscle compression for the quads and glutes, resulting in the perfect fit.
AQUARACE material is ultra-thin and lightweight thanks to high percentage of elastane, whilst remaining highly tear resistant. Moreover its thinness and water repellency enable ultra quick drying after swimming. In fact the water repellent fabric absorbs virtually no water and actually blocks it on the outer surface, creating micro bubbles that assist with buoyancy
The B-FAST Jammer is FINA (International Swimming Federation) approved competition swimwear.
The swimsuits and jammers benefiting from AQUARACE technology are designed for competitive swimmers to enhance performance by incorporating superior hydrodynamics, increased buoyancy as well as fatigue reduction during physical exercise.
Component provides good compression with its high elastane content and very good springback. The position of the red reinforcement stripes provides more compression at belt and leg level. Thanks to a scientific cut and a muscle compressing material, the drag coefficient of the water is increased and the blood flow optimises energy expenditure, which helps regulate fatigue
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 ABCDE rating is performed to help you easily identify the products with the best environmental performance by comparing the same type of products with each other (t-shirts, trousers, backpacks). Decathlon is a committed stakeholder in this environmental labelling approach. Website: Explanatory video:

Users reviews

3.74 / 5 23 ratings
16 users recommended this product
Distribution of ratings

At Decathlon, reviews are reliable.

  • Man
    20-29 years old
    03 September 2018
    Use since 2 to 8 weeks
    That review has been deposited on this product version
    Good item

    Little bit tighter and less stretchy than expected but great in the water

  • Man
    40-49 years old
    07 January 2018
    Use since 2 to 8 weeks
    That review has been deposited on this product version
    Echte Empfehlungen für Lange Strecken

    Typische "Race Skin" die allerdings nicht ganz so einschneidet an den Nähten am Bund und unten an den Beinen. Vor allem bei stärkerer Beinmuskulatur schneiden die getappten Jammer schon mal. Der Jammer ist sehr komfortabel und hat eine angenehme und moderate Kompression. Das ist über längere Distanzen 10Km+ sehr angenehm. Er lässt sich auch nass wieder über die Hüfte ziehen. Die Beinlänge und Gösse stimmen mit der Beschreibung überein. Also genau auswählen. Der einzige "Schönheitsfehler" ist, das sich der Aufdruck am Bein sehr schnell "auflöst". Hier solltet Decathlon einfach auf den Aufdruck verzichten. Das Fina logo hält aber.

  • Man
    20-29 years old
    25 February 2019
    Use since 1 week or less
    That review has been deposited on this product version
    Muy mala calidad, se rompe

    Compre este bañador para ir a una competicion, el primer dia bien, pero el segundo segun me lo estaba poniendo, el bañador se rompió empezando desde una costura y luego transversalmente, asi que no lo pude utilizar. Sin duda, una calidad pésima para el precio que tiene ya que no dura ni 2 usos en una misma competición.