Threadborne Siro fabric gives greater stretch & recovery, ultra-soft feel & more breathable performance Material wicks sweat & dries really fast Anti-odor technology is a superlative innovation which helps prevents odor Under Armour Description Threadborne Siro fabric gives greater stretch & recovery, ultra-soft feel & more breathable performance. Material wicks sweat & dries really fast. Anti-odor technology is a superlative innovation which helps prevents odor.