As the next-to-skin layer, a base layer's job is moving perspiration away from your skin, aka … See more

The insulating layer helps you retain the heat that's radiated by your body. The more efficiently this layer traps that heat, the warmer you'll be. Middle layer materials: Just as wit… See more

The outer layer (or shell layer) protects you from wind, rain and snow. Shells range from pricey mountaineering jackets to simple wind-resistant jackets. Most allow at least some … See more