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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
4.16 / 5 31 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 XS to XL
Intensive swimmers
Muscle compression
From EU size 36 to 48
Main fabric : 53.0% Polyamide, Main fabric : 47.0% Elasthane Main lining : 77.0% Polyamide, Main 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
Thermobonded seams are flat assemblies, making it more skin tight for superior hydrodynamics. This assembly technique creates a smooth, sleek quality finish, which promotes liquid streamline flow when in interaction with fabric and thus minimizes drag resistance.
The non-slip bands located at the edges (waistband and thigh) prevent the fabric from wrinkling. This enables the jammers to stay in place during dives and turns, cover as much skin as possible throughout the race and limit resistance.
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, trousers, backpacks, etc.). Decathlon chose to apply this voluntary environmental labelling scheme. For more information, visit: http://sustainability.decathlon.com/

Users reviews

4.16 / 5 31 ratings
24 users recommended this product
Distribution of ratings

At Decathlon, reviews are reliable.

  • 10 June 2019
    Use since 3 to 6 months
    That review has been deposited on this product version
    Excelente bañador

    Fantástico bañador. Parece increíble pero el primer día de uso vi una mejora de 1s por largo en 25m aproximadamente. Ajuste excelente en la cintura y parte baja de las piernas con sus comas interiores. El mejor bañador que he tenido.

  • Man
    30-39 years old
    24 May 2019
    Use since 2 to 8 weeks
    That review has been deposited on this product version
    Bañador competición.

    Me llamo Javier Núñez soi nadador internacional olímpico, primero: el bañador jammer 900 no cumple los requisitos para ser un bañador de competicion y el por qué: las costuras termoselladas no son buenas y se deshacen muy fácilmente, la tira antideslizante de la cintura es muy estrecha y el material podría mejorarse mucho...se podrían poner dos costuras antideslizante de mejor calidad con el cordón en medio de cada una, debería de bajar el bañador 3 centimetros más abajo por qué es muy alto e incomoin, el tejido impermeable repelente al agua es de mala calidad por qué se queda empapado en tan solo 50 o 100 metros, la costura antideslizante de la zona rodilla debería mejorarse, la flotabilidad del bañador no es correcta,el único beneficio bueno que tiene el bañador es que comprime bien la pierna para ayudar a no acomular ácido lactico y con ello reducir la fatiga muscular, pienso y opino que con la multinacional tan grande que es Decathlon podría tener su propio bañador de competición para los nadadores/as y los beneficios serían grandes ya que supuestamente el jammer 900 es homologado por fina federación Internacional de natación, doi las gracias y confío en que haya una gran mejora en este producto, yo ayudaría encantado a sus beneficios. Muchas gracias.

  • 09 April 2019
    Use since 2 to 8 weeks
    That review has been deposited on this product version

    Nada que envidiar a los bañadores de competición de otras marcas. Costuras termosellamadas con bandas de silicona en cintura y rodillas. Se ajusta perfectamente. La única pega, el la altura de la cintura, quizás medio cm menos sería perfecto.