MotorcycleUSA.com | Bates SP500 Adrenaline Boots Review MotorcycleUSA.com The SP500 Adrenaline, the “SP” designating it's from Bates' “Speed” collection, is among its first offerings. Boots from the “Speed” line have small reinforced panels at the ankles with Poron XRD, a soft foam whose urethane hardens to form a protective ... |