UA Microthread technology in the fabric dries faster, won‘t cling to you, won‘t chafe & stretches without absorbing sweat. HeatGearfabric is ultra-soft & smooth for extreme comfort with very little weight. Stretch-mesh back panel delivers strategic ventilation. 4-way stretch construction moves better in every direction. Material wicks sweat & dries really fast. Anti-odor technology prevents the growth of odor-causing microbes.