TYR Multisport Men's Tracer Tank 74% Polyester/ 26% Lycra Made in US Muscle compression technology reduces muscle undulation and focuses on the directional movement of the engaged muscle groups.This reduces fatugue and increases circulation. Teflon coating throughout the fabric and stitching makes the garment hydrophobic and fast through the water. Calendarization allows the fabric to warm the muscle groups quickly. The wicking properties then promote cooling, ultimately maintaining a constant body temperature. Balanced surface pressure from the compression panels triggers the acceleration of blood flow increasing muscle fiber activity.