India, Jan. 22 -- Once the temperature drops to "feels like 5 degrees" territory, I refuse to leave my New York apartment without wearing at least three layers of clothing. Warm and cozy base layers are the workhorse of my winter wardrobe-I'll pile on thermal tights and fleece-lined leggings under any wide-leg pants, and always have a long-sleeve shirt on before I pick out a chunky turtleneck to top it off. After a decade of New York winters, I've learned the hard way that packable, warm-yet-lightweight layers like these are non-negotiable.

Whether you're looking for a moisture-wicking turtleneck or toasty, fleece-lined long johns, Amazon's got you covered with hundreds of affordable options-some of which are on sale up to 60 percent off...