Men's Timberland Pro Powertrain Sport SD35 Work Shoes The Timberland PRO Powertrain Sport SD35 blends athletic style with jobsite protection, keeping you light on your feet through demanding shifts. Its durable synthetic upper features a modern hex-pattern design, paired with an ASTM F2413 alloy safety toe for proven protection. Electrostatic Dissipative (SD35) technology helps control static buildup in sensitive environments, while the Anti-Fatigue Technology footbed cushions every step. Finished with a slip- and oil-resistant outsole, this work sneaker is built for comfort and safety all day long.