The sharks skin technology fabrics move through water with less drag than smooth naked shin. The more skin you cover in sharks skin the faster you go, the current rules allow a male swim suit from waist to knee made from sharks skin fabric i.e. jammers. Wearing jammers made from fabrics with more drag than naked smooth skin eg Lycra or PBT (Endurance) actually slows you down. So if you cannot afford sharks skin wear Lycra or PBT (Endurance) briefs for minimum drag and speed through water.
Lycra and PBT (Endurance) jammers are a fashion item that make you swim slower, while only the rich and sponsored can afford shark skin jammers that although they are faster in the water don't last long.
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