The best travel and workout outfit, the Yathletics. The athletic wear features silver air technology that fights odor and bacteria. You can use any of the Yathletics product over a week without washing and still smell the same. I know what you're thinking but this item is perfect for working out and very convenient for traveling especially when you have a limited amount of space. The silver works this way, every time we sweat we produce water, water mixed with air makes the silver release silver ions that prevent mutation and reproduction of odorant bacteria.