Our sleek Mt. Washington work jackets combine the power of Thermolite® insulation with ripstop fabric to take on job sites in cooler weather. Plus, they're constructed with Timberland PRO FLEX™ technology maximum mobility features like stretch rib bi-swing back gussets and RainRepel™, a breathable, reinforced water-repellent outer layer that's durable and resists moisture penetration to help keep you dry.