A jammer is a style of swimsuit used mainly in competition to obtain speed advantages. Many manufacture this suit including Speedo, Diana, TYR and Blueseventy. They are made of nylon and lycra/spandex material and have a form fitting design to reduce water resistance. They provide moderate coverage from the mid-waist to the area above the knee, somewhat resembling cycling shorts or compression shorts worn by many athletes. They provide greater leg coverage than swim briefs and square leg suits, although they also have slightly more water resistance.
Certain makes can assist with buoyancy, helping the body maintain a more streamlined swimming position.
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