New silkier & smoother fabric! Go ahead, get sweaty. The PRO IONIC+ Trunk was made to move: BN3TH has elevated the breathable, moisture wicking wonder that is the Pro by adding IONIC+ NO STINK Technology, a permanent silver anti-odor technology that kills stink before it starts by preventing the growth of odor and won't wash out. This 6.5 inch style keeps your sweat wicked, your form tight and your boys fresh.