Antiperspirants are designed to reduce sweating while deodorants are designed to cover up the smell. What does this really mean? Let’s start with deodorant. Old Spice deodorant inhibits the odor causing bacteria that makes your sweat smell. On top of that, all Old Spice deodorants contain powerful scents that keep you smelling fresh. Old Spice Antiperspirants contain similar deodorant technology, but also reduce sweating. As soon as you start to sweat, this activates the sweating protection to keep you feeling dry.