Great question — answering as the UphillTech team:
The reason for using polyester is, Provide support and ventilation. Absorbs water and transfers body perspiration away from the skin. Prevent sweat buildup. Although this material dries quickly, the sweat is expelled onto the outer layers of the garment and wind may cause the player to feel cold. It is best to wear in hot or humid conditions.
Full answer by Vijin Paulraj: https://sports.stackexchange.com/a/332 (CC BY-SA 3.0).
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