The Timberland PRO® Resistor with 252OD ballistic nylon upper is an original classic, all purpose work-boot with a few new upgrades including a 252OD ballistic nylon upper. It’s three-layered outsole is now lighter and more durable than ever, while the Dynamic Anti-Fatigue Technology insole brings a whole new level of comfort. So if you’re a fan of the basic classic thwat was made for not other reson than to get the job done, the Timberland PRO® Resistor is your no-frills, all-tough work boot. Well, maybe a couple of frills.