The air is sharp, the kind that wakes you up before your first mile does. You zip into your Men's Brooks Shield Hybrid Jacket 3.0, and the windproof panels block the bite while 80 g of lightweight THERMOLITE® insulation traps just enough warmth. Mid-run, you vent some heat, thanks to clever draft flap snaps, your jacket stays put. Hands tucked in cozy pockets, you push forward. Winter doesn't stand a chance.