Ergodyne is a go-to outwear brand for carpenter Doug Mahoney of Harvard, Mass. For the last few months he's been wearing the CORE Performance Thermal Vest (and on  colder mornings theThermal Jacket). Both are light but still warm enough, when properly layered underneath, for working in the frigid weather this winter has been delivering (and delivering , and delivering ... ). The CORE vest and jacket offer some nice touches that anyone in construction can appreciate: They reinforced the tops of the shoulders with a durable fabric, so when you haul 2x4s around on your shoulders, you won’t damage the vest. And both vest and jacket are loaded with pockets designed for those in the trades.  Read more.